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 A248330 #13 Jul 05 2015 00:41:23
%S A248330 1,1,4,160,107520,1722040320,854352419880960,16185399027773630054400,
%T A248330 13931397052191274338996977664000,
%U A248330 632089112919018408339999461491467091968000,1721041721929360607907210006858724622834371563356160000
%N A248330 The product of the first n Catalan numbers and the number of standard Young tableaux of shape(1,2,...,n).
%C A248330 The volume of a certain polytope (the Tesler polytope) whose lattice points are Tesler matrices (A008608), and with (n+1)! integral vertices (permutation Tesler matrices).
%C A248330 This is also the iterated constant term of the rational function (x1+x2+...+xn+x(n+1))^binomial(n+1,2)*product_{1<=i<j<=n+1}(xj-xi)^(-1).
%H A248330 K. Mészáros, A.H. Morales, B. Rhoades, <a href="http://arxiv.org/abs/1409.8566">The polytope of Tesler matrices</a>, ArXiv:1409.8566, 2014.
%F A248330 a(n) = A005118(n+1) * A003046(n).
%F A248330 a(n) = A005118(n+1) * Product_{k=0..n} A000108(k).
%p A248330 A248330 := proc(n) local i; mul(binomial(2*k, k)/(1+k), k=0..n)*binomial(n+1, 2)!/ mul( (2*i+1)^(n-i), i=0..n-1 ); end;
%Y A248330 Cf. A000108, A003046, A005118, A008608.
%K A248330 nonn,easy
%O A248330 0,3
%A A248330 _Alejandro H. Morales_, Oct 04 2014