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 A196496 #10 Mar 31 2012 10:28:39 %S A196496 1,2636362,106515601,3066863686603,148749979947841,219339595933912, %T A196496 853637858736358 %N A196496 Palindromic centered 37-gonal numbers. %C A196496 The centered k-gonal numbers are defined in trottermath.net as (k*n^2-k*n+2)/2, and elsewhere with a slightly different standard index n as (k*n^2+k*n+2)/2. The centered 37-gonal numbers are 1, 38, 112, 223, 371, 556, 778,.... A086272(36,n), where A086272 uses yet another index convention for k. The sequence is generated by centered 37-gonal numbers with standard indices n=1, 377, 2399, 407156,... %H A196496 T. Trotter, <a href="http://trottermath.net/polygonal-numbers/">Polygonal numbers</a> %K A196496 nonn,base,more %O A196496 1,2 %A A196496 _Kausthub Gudipati_, Oct 03 2011