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A201989
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T(n,k)=Number of nXk zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing
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7
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1, 4, 4, 8, 77, 8, 18, 1170, 1170, 18, 32, 14107, 134217, 14107, 32, 58, 139471, 11648559, 11648559, 139471, 58, 94, 1177568, 803133854, 7375608084, 803133854, 1177568, 94, 151, 8721417, 46034224561, 3674187761233, 3674187761233
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OFFSET
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1,2
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COMMENTS
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Table starts
...1........4..............8.................18...................32
...4.......77...........1170..............14107...............139471
...8.....1170.........134217...........11648559............803133854
..18....14107.......11648559.........7375608084........3674187761233
..32...139471......803133854......3674187761233....13189629907532856
..58..1177568....46034224561...1507315600099908.38785259210265819578
..94..8721417..2263314310579.526500713340421071
.151.57801225.97590406110264
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LINKS
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EXAMPLE
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Some solutions for n=3 k=3
.-3..2..2...-3.-1..3...-3.-3..2...-3.-1..1...-2..0..2...-3.-1..1...-3.-3.-3
..1.-2.-1...-3..1.-2...-1..0..1....0.-3..2...-2..3.-1....1..2.-3....1..2..3
..3.-2..0....0..2..3....0..1..3....2..2..0...-1.-1..2....3..2.-2....2.-1..2
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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