A177622 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, down

1, 20, 1662, 353608, 153356948, 118150658380, 147434290284772, 278770751057930416

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177609 A094035 A177614 * A177627 A177620 A177632

Adjacent sequences: A177619 A177620 A177621 * A177623 A177624 A177625

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved