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A299063
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Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
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1
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2, 64, 993, 13765, 196699, 2827609, 40585250, 582407760, 8358259950, 119952006315, 1721463741562, 24705187860146, 354550820208077, 5088254555610537, 73022914681708450, 1047971560792616433
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 12*a(n-1) +26*a(n-2) +98*a(n-3) +216*a(n-4) -360*a(n-5) -405*a(n-6) -1419*a(n-7) -639*a(n-8) +4900*a(n-9) +2551*a(n-10) -4072*a(n-11) -2299*a(n-12) -1442*a(n-13) +1353*a(n-14) +2705*a(n-15) -1262*a(n-16) -1460*a(n-17) +621*a(n-18) +18*a(n-19) +55*a(n-20) -12*a(n-21) -4*a(n-22) for n>23
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EXAMPLE
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Some solutions for n=5
..0..0..1..0. .0..0..0..0. .0..0..1..1. .0..0..0..0. .0..0..1..1
..1..0..0..1. .1..0..0..1. .1..0..1..1. .1..0..0..0. .0..1..1..1
..1..1..0..1. .1..1..0..1. .1..1..1..0. .0..1..1..1. .1..0..1..1
..0..0..1..1. .0..0..1..0. .0..1..0..0. .1..1..1..0. .1..0..1..0
..0..1..0..0. .0..0..0..1. .1..0..1..1. .1..0..0..1. .0..0..0..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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