A177635 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up, up, up, up.

1, 1, 20, 1680, 369600, 168168000, 137225088000, 182499151015439, 369333660414653745, 1080107104118231632500, 4384231121059173932562000, 23913914175434871142808715000, 170693577054027116430454774306800, 1559452501977701854639515593122328400

Offset

0,3

Links

Table of n, a(n) for n=0..13.

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

Crossrefs

Cf. A014606.

Sequence in context: A177615 A177616 A177295 * A177296 A177297 A014606

Adjacent sequences: A177632 A177633 A177634 * A177636 A177637 A177638

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Extensions

a(10)-a(13) from Alois P. Heinz, Aug 08 2018

Status

approved