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 A245190 #3 Jul 21 2014 01:14:37 %S A245190 1,3,336,80510976,4632013631072036192256, %T A245190 9259244309598002961669050091730162686136971834955923456 %N A245190 Products of successive blocks of 2^n terms of A245180. %e A245190 a(2) = 1*8*3*14 = 336. %Y A245190 Cf. A245180. %K A245190 nonn %O A245190 0,2 %A A245190 _N. J. A. Sloane_, Jul 21 2014