A177594 Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, up, up, up, up.

1, 1, 6, 90, 2520, 113400, 7484400, 681040081, 81715496353, 12500505087678, 2374643401938450, 548423992273068450, 151329242873227786290, 49169594830177508466780, 18581179389079670034395725, 8080585890092465008705929001, 4006831811683726939901512184106

Offset

0,3

Links

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

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

Mingjia Yang, An experimental walk in patterns, partitions, and words, Ph. D. Dissertation, Rutgers University (2020).

Crossrefs

Cf. A177558, A177564, A177574.

Sequence in context: A177574 A177575 A177286 * A177287 A177288 A177289

Adjacent sequences: A177591 A177592 A177593 * A177595 A177596 A177597

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