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 A247002 #5 Feb 04 2015 15:27:01 %S A247002 1,3,12,40,125,458,1790 %N A247002 A164982(2^n). %C A247002 There are the numbers of ON cells in A164982 when we reach a triangle that is as full as it can be. %H A247002 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %Y A247002 Cf. A164982. %K A247002 nonn,more %O A247002 0,2 %A A247002 _N. J. A. Sloane_, Sep 21 2014