A177664 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, up

1, 70, 34650, 62535012, 298008705724, 3096240217354400, 61728668707508479572

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177665 A177654 A177660 * A177674 A177675 A177300

Adjacent sequences: A177661 A177662 A177663 * A177665 A177666 A177667

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved