%I #15 Apr 16 2018 11:12:32

%S 1,2,6,23,105,550,3228,20878,146994,1116000,9068288,78384726,

%T 717102126,6913783826,69991576572

%N Number of permutations avoiding the pattern 12-3-4.

%H Andrew M. Baxter and Lara K. Pudwell, <a href="http://arxiv.org/abs/1108.2642">Enumeration schemes for dashed patterns</a>, arXiv preprint arXiv:1108.2642 [math.CO], 2011.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Nov 17 2011

%E a(11)-a(15) from _Lars Blomberg_, Apr 16 2018