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 A144340 #2 Mar 31 2012 13:20:15 %S A144340 1,4,52,712,13464,299520,8455392,273091392,10372138560,443940231168, %T A144340 21373226590464,1136301643620864,66301616889414144, %U A144340 4203565310173630464,287934809159520681984,21176025476308764622848,1664420505612432224993280,139202656243140427345723392 %N A144340 Third column (m=3) of triangle S2hat(-4) = A144285. %F A144340 a(n)=A144285(n+3,3), n>=0. %Y A144340 A144339 (m=2 column). %K A144340 nonn,easy %O A144340 0,2 %A A144340 _Wolfdieter Lang_ Oct 09 2008