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 A233734 #4 Dec 15 2013 09:38:46 %S A233734 1,6,150,8400,834120,129230640,28805736960,8734434508800, %T A233734 3457819037312640,1732015476199008000,1070842073499515116800, %U A233734 800968643959240044288000,712900933001021056900608000,744602794912654938776355840000,901893717412811100821094451200000 %N A233734 Central terms of triangles A019538 and A090582. %C A233734 a(n) = A019538(2*n-1,n) = A090582(2*n-1,n). %H A233734 Reinhard Zumkeller, <a href="/A233734/b233734.txt">Table of n, a(n) for n = 1..200</a> %F A233734 a(n) = A129506(n) * n!. %o A233734 (Haskell) %o A233734 a233734 n = a019538 (2 * n - 1) n %K A233734 nonn %O A233734 1,2 %A A233734 _Reinhard Zumkeller_, Dec 15 2013