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%I #7 Feb 23 2014 05:05:50
%S 0,0,1,1,3,8,24,70,224,744,2588,9317,34924,135297,542123,2236834,
%T 9508297,41511215,186109781,854874944,4021672983,19344343843,
%U 95093249014,477137036748,2442413708120,12742038926613,67714763161526,366266085720565,2015454903261855
%N Number of standard Young tableaux with n cells and exactly one succession.
%C A succession is a pair of cells (v, v+1) lying in the same row.
%C Also number of ballot sequences having one flat step.
%C Second column (k=1) of A238125.
%Y Cf. A237770 (no successions), A238127 (two successions).
%K nonn
%O 0,5
%A _Joerg Arndt_ and _Alois P. Heinz_, Feb 21 2014
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