A177305 Number of permutations of 6 copies of 1..n with all adjacent differences <= 2 in absolute value.

1, 1, 924, 17153136, 47768769048, 83659800759150, 202929004783993742

Offset

0,3

Comments

a(n) = (6n)!/720^n for n<=3.

Links

Table of n, a(n) for n=0..6.

Crossrefs

Cf. A248814.

Sequence in context: A179715 A351485 A362171 * A177306 A248814 A172558

Adjacent sequences: A177302 A177303 A177304 * A177306 A177307 A177308

Keyword

nonn

Author

R. H. Hardin, May 06 2010

Status

approved