A177602 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, down

1, 18, 1200, 196544, 64274760, 36903349792, 34074227986704, 47451264308831568

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Crossrefs

Sequence in context: A064564 A152933 A360602 * A252969 A182286 A292609

Adjacent sequences: A177599 A177600 A177601 * A177603 A177604 A177605

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved