A177605 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up, up.
1, 1, 20, 1680, 369600, 166923119, 134612399509, 176468898415460, 351456009607660440, 1010384984894493146400, 4028532188816344883922611, 21572165225621811583520157531, 151100918612288209338643024889160, 1354217120536797195675961944817053840
Offset: 0
Keywords
Links
- 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).
Extensions
a(10) from Alois P. Heinz, Nov 01 2013
a(11)-a(13) from Alois P. Heinz, Aug 08 2018