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

0,3

Comments

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

Links

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

Crossrefs

Cf. A172609.

Sequence in context: A140917 A351487 A177311 * A172609 A172560 A031805

Adjacent sequences: A177309 A177310 A177311 * A177313 A177314 A177315

Keyword

nonn

Author

R. H. Hardin, May 06 2010

Status

approved