A177644 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up

1, 70, 29874, 43724128, 163394718481, 1305717814847931, 19780733910930967382

Offset

1,2

Links

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

Crossrefs

Sequence in context: A005983 A200313 A177642 * A146499 A177649 A177651

Adjacent sequences: A177641 A177642 A177643 * A177645 A177646 A177647

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved