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A177307
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Number of permutations of 7 copies of 1..n with all adjacent differences <= 1 in absolute value.
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2
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1, 1, 3432, 623576, 201922730, 48203722464, 11408205434138, 2535604038015218, 546641872918476120, 114573118435555703030, 23513682407867601161354, 4742254932865402388419776, 942857462878069039167940082, 185226548794692635344238756018, 36021105095432337381819132791160
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OFFSET
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0,3
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COMMENTS
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a(n) = (7n)!/5040^n = A172603(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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