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A177304
Number of permutations of 6 copies of 1..n with all adjacent differences <= 1 in absolute value.
2
1, 1, 924, 65226, 7426610, 640160976, 54331653686, 4339892975512, 336181036999948, 25328979140590460, 1869147741803280158, 135594223551932310368, 9700134237572864570026, 685890678156217774839644, 48025674779522388568648420, 3334799454210630503054336064
OFFSET
0,3
COMMENTS
a(n) = (6n)!/720^n = A248814(n) for n<=2.
LINKS
CROSSREFS
Column k=6 of A331562.
Cf. A248814.
Sequence in context: A172224 A283577 A361608 * A022053 A107517 A140906
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jan 21 2020
a(9) from Alois P. Heinz, Jan 23 2020
Terms a(10) and beyond from Andrew Howroyd, May 15 2020
STATUS
approved