A177302 Number of permutations of 5 copies of 1..n with all adjacent differences <= 2 in absolute value.

1, 1, 252, 756756, 457507512, 184619047020, 97087382008034, 49254897805981056, 22802419346927105088

Offset

0,3

Comments

a(n) = (5n)!/120^n for n<=3.

Links

Table of n, a(n) for n=0..8.

Crossrefs

Cf. A014609.

Sequence in context: A362170 A203062 A259452 * A177303 A014609 A172557

Adjacent sequences: A177299 A177300 A177301 * A177303 A177304 A177305

Keyword

nonn,more

Author

R. H. Hardin, May 06 2010

Extensions

a(0), a(8) from Alois P. Heinz, Jan 19 2016

Status

approved