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A177304
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Number of permutations of 6 copies of 1..n with all adjacent differences <= 1 in absolute value.
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2
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1, 1, 924, 65226, 7426610, 640160976, 54331653686, 4339892975512, 336181036999948, 25328979140590460, 1869147741803280158, 135594223551932310368, 9700134237572864570026, 685890678156217774839644, 48025674779522388568648420, 3334799454210630503054336064
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OFFSET
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0,3
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COMMENTS
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a(n) = (6n)!/720^n = A248814(n) for n<=2.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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