A177303 Number of permutations of 5 copies of 1..n with all adjacent differences <= 3 in absolute value.

1, 1, 252, 756756, 11732745024, 52977847995072, 131319696504676680, 302061042944500510428, 847432462636241316703042

Offset: 0

Author

R. H. Hardin, May 06 2010

Keywords

• nonn

Comments

a(n) = (5n)!/120^n for n<=4.

Crossrefs

Cf. A014609.

Extensions

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