A177312 Number of permutations of 8 copies of 1..n with all adjacent differences <= 3 in absolute value.

1, 1, 12870, 9465511770, 99561092450391000, 151158246783053570131500, 91756879673807945288868127380

Offset: 0

Author

R. H. Hardin, May 06 2010

Keywords

• nonn

Comments

a(n) = (8n)!/40320^n for n<=4.

Crossrefs

Cf. A172609.