A177665 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, down, down.

1, 70, 34650, 62158032, 293740766206, 3022680843796560, 59637844964780107288

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Crossrefs

Sequence in context: A177648 A177653 A177659 * A177654 A177660 A177664

Adjacent sequences: A177662 A177663 A177664 * A177666 A177667 A177668

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Status

approved