A177675 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, up, down, down, down

1, 70, 34650, 62987418, 303953291280, 3208757131366020, 65143699363358402128

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177660 A177664 A177674 * A177300 A266741 A177646

Adjacent sequences: A177672 A177673 A177674 * A177676 A177677 A177678

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved