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 A246731 #3 Sep 02 2014 07:56:02 %S A246731 1,1,3,14,106,971,10616,123330,1557753,20543071,287087740,4168599808, %T A246731 63349129196,996257865899,16268585660692,273934662738565, %U A246731 4763228582494891,85139749375446911,1565168115090666500,29500470904432682460,570091884338189871500 %N A246731 Number of standard Young tableaux with 2n cells and largest value in row n. %C A246731 Also the number of ballot sequences of length 2n having last value n. %C A246731 Also the number of standard Young tableaux with 2n cells where the row containing the largest value has length n. %C A246731 Also the number of ballot sequences of length 2n where the last value has multiplicity n. %F A246731 a(n) = A238750(2n,n). %Y A246731 Cf. A238750. %K A246731 nonn %O A246731 0,3 %A A246731 _Joerg Arndt_ and _Alois P. Heinz_, Sep 02 2014