A177651 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, down.

1, 70, 32154, 51547778, 212793102720, 1884903364393901, 31693834047691904775

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177644 A146499 A177649 * A177645 A177662 A177669

Adjacent sequences: A177648 A177649 A177650 * A177652 A177653 A177654

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Status

approved