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 A247085 #13 Jan 15 2015 09:57:36 %S A247085 1,0,0,2,4,2,10,12,34,54,128,214,444,768,1476,2730,5118,9768,18282, %T A247085 34682,65390,123772,236620 %N A247085 a(n) = A253174(2^n). %C A247085 See comment in A253174. %Y A247085 Cf. A098550, A253174. %K A247085 nonn,more %O A247085 0,4 %A A247085 _Vladimir Shevelev_, Jan 10 2015 %E A247085 More terms from _Peter J. C. Moses_, Jan 10 2015