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 A116869 #2 Mar 31 2012 13:20:11 %S A116869 132,297,869,2739,8986,30275,104006,362738,1280592,4566642,16423581, %T A116869 59497075,216901454,795117015,2929034130,10837075830,40253156520, %U A116869 150045410430,561097823490,2104382963214,7913603390196 %N A116869 Sixth column of triangle A028364. %C A116869 Also sixth diagonal of triangle A067323. %F A116869 a(n)= A028364(n+5,5) = sum(C(k)*C(n+5-k),k=0..5), with the Catalan numbers C(n):=A000108(n). %F A116869 G.f.: (c5(x)*c(x)-(c5(x)-1)/x)/x^5, with c5(x) := sum(C(k)*x^k, k=0..5) and c(x) is the g.f. for the Catalan numbers A000108. %Y A116869 Cf. A067296 (fifth column). %K A116869 nonn,easy %O A116869 0,1 %A A116869 _Wolfdieter Lang_, Mar 24 2006