A177650 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, up

1, 70, 33607, 56904056, 249804639258, 2365851085271034, 42713565749790262494

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177662 A177669 A177667 * A177655 A177663 A177668

Adjacent sequences: A177647 A177648 A177649 * A177651 A177652 A177653

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved