A177648 - OEIS

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A177648

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

1, 70, 34650, 60778746, 277113842057, 2730472552564105, 51347486465256186884

(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: A266740 A177640 A177641 * A177653 A177659 A177665

Adjacent sequences: A177645 A177646 A177647 * A177649 A177650 A177651

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved