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

Author

R. H. Hardin, May 06 2010

Keywords

• nonn
• more

Comments

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

Crossrefs

Cf. A014609.

Extensions

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