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%I #9 Jul 19 2017 10:42:12
%S 1,4,16,66,296,1334,6322,30930,158008,837530,4624462,26379128,
%T 155536148,944173842,5898860754,37848982610,249347884600,
%U 1684168485302,11655678956456,82532887947582,597399961515754,4414814240798968,33281178413298246,255687224968704234
%N Number of solid standard Young tableaux of n cells and height two.
%H S. B. Ekhad, D. Zeilberger, <a href="https://arxiv.org/abs/1202.6229">Computational and Theoretical Challenges on Counting Solid Standard Young Tableaux</a>, arXiv:1202.6229 [math.CO], 2012
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Young_tableau">Young tableau</a>
%Y Column k=2 of A214753.
%K nonn
%O 2,2
%A _Alois P. Heinz_, May 25 2016