A177315 Number of permutations of 9 copies of 1..n with all adjacent differences <= 3 in absolute value.

1, 1, 48620, 227873431500, 21452752266265320000, 230729955958244519983206000

Offset

0,3

Comments

a(n) = (9n)!/362880^n for n<=4.

Links

Table of n, a(n) for n=0..5.

Crossrefs

Cf. A172613.

Sequence in context: A140924 A351488 A177314 * A172613 A172554 A244172

Adjacent sequences: A177312 A177313 A177314 * A177316 A177317 A177318

Keyword

nonn

Author

R. H. Hardin, May 06 2010

Status

approved