A177654 - OEIS

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A177654

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

1, 70, 34650, 62234190, 293951256700, 3019523592165814, 59424738039571181776

(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: A177653 A177659 A177665 * A177660 A177664 A177674

Adjacent sequences: A177651 A177652 A177653 * A177655 A177656 A177657

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved