A177669 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, up

1, 70, 33261, 56506806, 250834987380, 2414371474673571, 44451152905883329021

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177651 A177645 A177662 * A177667 A177650 A177655

Adjacent sequences: A177666 A177667 A177668 * A177670 A177671 A177672

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved