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A177564 Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, up, up. 0
1, 1, 6, 90, 2520, 112681, 7368841, 663399996, 78683697960, 11891546908080, 2230852444731961, 508662924427157281, 138544315556694333336, 44427011758118629606980, 16567455622575976083141540, 7109119064485787682672633841, 3478010197625548606811131876321 (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: A132467 A177284 A266735 * A177565 A177576 A177588

Adjacent sequences:  A177561 A177562 A177563 * A177565 A177566 A177567

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 08 2018

STATUS

approved

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Last modified January 15 18:46 EST 2019. Contains 319168 sequences. (Running on oeis4.)