A177660 - OEIS

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A177660

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

1, 70, 34650, 62484750, 297230343314, 3080473154954302, 61234390521656478875

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

CROSSREFS

Sequence in context: A177659 A177665 A177654 * A177664 A177674 A177675

Adjacent sequences: A177657 A177658 A177659 * A177661 A177662 A177663

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved