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A285485
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Number of (n+1)-extended Skolem sequences of order n.
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0
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0, 0, 2, 2, 0, 0, 44, 260, 0, 0, 33104, 203712, 0, 0, 75499696, 621309008, 0, 0, 492805156768, 5068810602400, 0, 0, 7346944632542720
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OFFSET
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1,3
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COMMENTS
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Number of Rosa sequences of order n.
a(n) computed counting reflected solutions.
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LINKS
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EXAMPLE
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For n = 3, there are 2 solutions: 1 1 3 0 2 3 2 and 2 3 2 0 3 1 1.
For n = 4, there are 2 solutions: 1 1 3 4 0 3 2 4 2 and 2 4 2 3 0 4 3 1 1.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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a(1)-a(18) from Jeppe Winther Larsen (jwl(AT)itu.dk), Oct 12 2009
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STATUS
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approved
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