A177592 - OEIS

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A177592

Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, down, up, up, up

0

1, 6, 90, 2512, 112440, 7367330, 664573798, 78969593280, 11955422386863, 2246458143581603

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A177583 A177578 A177582 * A177593 A132467 A177284

Adjacent sequences: A177589 A177590 A177591 * A177593 A177594 A177595

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved