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 A067325 #4 Mar 31 2012 13:20:07 %S A067325 5,19,66,227,785,2739,9646,34268,122706,442510,1605956,5861481, %T A067325 21502585,79243395,293246550,1089264360,4059928950,15179606010, %U A067325 56917649820,213982542150,806429435994,3046017513198 %N A067325 Fourth column of triangle A067323. %C A067325 Also fourth diagonal of triangle A028364. %F A067325 a(n)= A067323(n+3, 3)= C(n+4)-(C(n+3)+C(n+2)+2*C(n+1)), C(n) := A000108(n) (Catalan). %F A067325 G.f.: (c(x)^3)*(2+2*c(x)+c(x)^2), with c(x) g.f. of A000108 (Catalan). %Y A067325 Cf. A067324 (third column). %K A067325 nonn,easy %O A067325 0,1 %A A067325 _Wolfdieter Lang_, Feb 05 2002