%I #21 Mar 12 2021 19:06:07
%S 1,1,20,1680,347279,145417911,108103451700,130235191847880,
%T 237916352264650149,626620767478218488341,2286998940761680215812180,
%U 11203494211631147331264432480,71758642346800717617629677669619,587889139521679290927189491977855371
%N Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up.
%H Mingjia Yang and Doron Zeilberger, <a href="https://arxiv.org/abs/1805.06077">Increasing Consecutive Patterns in Words</a>, arXiv:1805.06077 [math.CO], 2018.
%H Mingjia Yang, <a href="https://doi.org/10.7282/t3-d9z1-aw94">An experimental walk in patterns, partitions, and words</a>, Ph. D. Dissertation, Rutgers University (2020).
%Y Cf. A014606.
%K nonn
%O 0,3
%A _R. H. Hardin_, May 10 2010
%E a(10) from _Alois P. Heinz_, Nov 01 2013
%E a(11)-a(13) from _Alois P. Heinz_, Aug 08 2018