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A177574 Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, up, up, up. 0
1, 1, 6, 90, 2520, 113400, 7479361, 679851145, 81464937000, 12443633129640, 2360051647753800, 544135452733303200, 149883590538452902825, 48612505145280415315705, 18337020151083296373118050, 7959571454218402191668618850, 3939389912325851696444898536160 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..16.

Mingjia Yang, Doron Zeilberger, Increasing Consecutive Patterns in Words, arXiv:1805.06077 [math.CO], 2018.

CROSSREFS

Sequence in context: A177588 A177589 A177285 * A177575 A177286 A177594

Adjacent sequences:  A177571 A177572 A177573 * A177575 A177576 A177577

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 10 2010

EXTENSIONS

a(12)-a(14) from Alois P. Heinz, Nov 01 2013

a(0), a(15)-a(16) from Alois P. Heinz, Aug 10 2018

STATUS

approved

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Last modified January 18 13:42 EST 2019. Contains 319271 sequences. (Running on oeis4.)