A177612 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up, up.

1, 1, 20, 1680, 362082, 159459279, 124951069219, 158754672447498, 305860462403616044

Offset

0,3

Links

Table of n, a(n) for n=0..8.

Crossrefs

Cf. A014606.

Sequence in context: A177599 A177600 A177607 * A177618 A177624 A177613

Adjacent sequences: A177609 A177610 A177611 * A177613 A177614 A177615

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Status

approved