A177662 - OEIS

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A177662

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

1, 70, 33156, 55668310, 242732516630, 2284636735396701, 40994714881022611899

(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: A177649 A177651 A177645 * A177669 A177667 A177650

Adjacent sequences: A177659 A177660 A177661 * A177663 A177664 A177665

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved