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%I #4 Oct 30 2015 20:56:10
%S 1,1,2,6,24,120,720,5018,39374,337816,3092691,29659731,294107811,
%T 2988678546,30935695794,324832481490,3450158410649,36993206191004,
%U 399827092167771,4351269802153188
%N Number of permutations that are sortable with two stacks in series.
%H Andrew Elvey-Price, Anthony J Guttmann, <a href="http://arxiv.org/abs/1510.08663">Permutations sortable by two stacks in series</a>, arXiv:1510.08663 [math.CO], (29-October-2015)
%K nonn
%O 0,3
%A _Joerg Arndt_, Oct 30 2015
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