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 A089500 #5 Sep 26 2012 05:05:15 %S A089500 1,2,10,630,2520,277200,97297200,3405402000,463134672000, %T A089500 475176173472000,16631166071520000,4207685016094560000, %U A089500 3786916514485104000000,98459829376612704000000 %N A089500 Denominators for computation of column sequences of triangle A071951 (Legendre-Stirling). %C A089500 The k-th column sequence A071951(n+k,k), n>=0, is sum(A089278(k,p)*(p*(p+1))^n,p=1..k)/a(k), k>=1. %F A089500 a(n)= N(n)/D(n) with N(n) := sfac(n-1)*sfac(2*n+1)/sfac(n+1)= A089501(n) and D(n) := gcd([seq((2*m+1)*((m*(m+1))^n)*N(n)/((n+m+1)!*(n-m)!), m=1..n)]), where sfac(n)=A000178(n) (superfactorials) and gcd(L) is the greatest common divisor >1 of a list of numbers L. %K A089500 nonn %O A089500 1,2 %A A089500 _Wolfdieter Lang_, Nov 07 2003