A177661 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, down, down

1, 70, 34302, 60601152, 281381782044, 2841788674410678, 54998505166544652117

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177663 A177668 A177673 * A177672 A177299 A266740

Adjacent sequences: A177658 A177659 A177660 * A177662 A177663 A177664

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved