A177659 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, up, down

1, 70, 34650, 61936740, 290927564416, 2971394893453510, 58139421887847131772

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177641 A177648 A177653 * A177665 A177654 A177660

Adjacent sequences: A177656 A177657 A177658 * A177660 A177661 A177662

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved