A177663 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, down

1, 70, 34052, 59177576, 268686190790, 2643357374211756, 49707855255794171208

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177667 A177650 A177655 * A177668 A177673 A177661

Adjacent sequences: A177660 A177661 A177662 * A177664 A177665 A177666

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved