A177643 - OEIS

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A177643

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

1, 60, 21524, 26227974, 81550349446, 541799718812754, 6819616215236462578

(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: A003794 A275051 A068295 * A123482 A263606 A220371

Adjacent sequences: A177640 A177641 A177642 * A177644 A177645 A177646

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved