A177596 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up.
1, 1, 20, 1109, 149777, 40505320, 19324787629, 14885613436177, 17346023517866756, 29095672934852234945, 67554301929824585326841, 210353969049597164741983000, 855886755812900060235077981449, 4452236180954942685194928540509281
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, Oct 22 2013
a(0), a(11)-a(13) from Alois P. Heinz, Aug 08 2018