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 A098431 #6 Apr 30 2014 01:28:30 %S A098431 1,2,12,168,4272,171168,9915072,783454848,80965577472,10599312542208, %T A098431 1714108476337152,335566486059952128,78206210287187177472, %U A098431 21396344618478777704448,6790389880757556630700032 %N A098431 Constant terms of polynomials in A098277. %F A098431 G.f. 1/G(0) where G(k) = 1 - x*(2*k+1)*(2*k+2)/(1 - (2*k+2)^2*x/G(k+1)); (continued fraction, 2-step). - Sergei N. Gladkovskii, Aug 11 2012 %K A098431 nonn %O A098431 0,2 %A A098431 _Ralf Stephan_, Sep 07 2004