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A195004
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Number of ways to place 7n nonattacking kings on a 14 X 2n cylindrical chessboard.
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2
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1024, 4100, 19648, 103508, 580664, 3419648, 20984924, 133538996, 877751236, 5937279840, 41180193352, 291859775552, 2106967145904, 15448890481568, 114765555945488, 861942483797204, 6533144250310688, 49899718750389380, 383593821097441412, 2964842429047018248
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OFFSET
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1,1
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COMMENTS
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This cylinder is horizontal: a chessboard where it is supposed that the rows 1 and 2n are in contact (number of columns = 14, number of rows = 2n)
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LINKS
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Table of n, a(n) for n=1..20.
V. Kotesovec, Number of ways of placing non-attacking queens, kings, bishops and knights
Vaclav Kotesovec, G.f., recurrence and explicit formula
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CROSSREFS
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Cf. A174155, A194644, A194645, A194646, A194647, A194648, A137432, A195595.
Sequence in context: A223065 A195093 A195234 * A135289 A189071 A214800
Adjacent sequences: A195001 A195002 A195003 * A195005 A195006 A195007
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KEYWORD
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nonn
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AUTHOR
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Vaclav Kotesovec, Sep 07 2011
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STATUS
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approved
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