A177626 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up

1, 20, 1641, 344480, 147006679, 111311764989, 136403265458329, 253125152123179563

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177604 A177621 A177628 * A177609 A094035 A177614

Adjacent sequences: A177623 A177624 A177625 * A177627 A177628 A177629

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved