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A177569 Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, down, down 0
1, 6, 88, 2328, 96960, 5846821, 481944258, 52084697975, 7147002322581, 1214148768638010 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

CROSSREFS

Sequence in context: A218260 A177567 A177563 * A327645 A309165 A127183

Adjacent sequences:  A177566 A177567 A177568 * A177570 A177571 A177572

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved

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Last modified April 8 21:16 EDT 2020. Contains 333328 sequences. (Running on oeis4.)