A177652 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up

1, 65, 27707, 41243158, 159108376040, 1325880163281871, 21089698925887652590

Offset

1,2

Links

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

Crossrefs

Sequence in context: A355469 A084225 A278550 * A278795 A289946 A219564

Adjacent sequences: A177649 A177650 A177651 * A177653 A177654 A177655

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved