This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A238126 #7 Feb 23 2014 05:05:50 %S A238126 0,0,1,1,3,8,24,70,224,744,2588,9317,34924,135297,542123,2236834, %T A238126 9508297,41511215,186109781,854874944,4021672983,19344343843, %U A238126 95093249014,477137036748,2442413708120,12742038926613,67714763161526,366266085720565,2015454903261855 %N A238126 Number of standard Young tableaux with n cells and exactly one succession. %C A238126 A succession is a pair of cells (v, v+1) lying in the same row. %C A238126 Also number of ballot sequences having one flat step. %C A238126 Second column (k=1) of A238125. %Y A238126 Cf. A237770 (no successions), A238127 (two successions). %K A238126 nonn %O A238126 0,5 %A A238126 _Joerg Arndt_ and _Alois P. Heinz_, Feb 21 2014