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 A249037 #4 Oct 26 2014 18:06:00 %S A249037 0,1,2,2,3,4,4,4,5,5,6,7,7,7,8,9,9,9,10,10,11,11,12,13,13,13,14,15,15, %T A249037 15,16,17,17,17,18,19,19,19,20,20,21,21,22,22,23,23,24,25,25,25,26,27, %U A249037 27,27,28,29,29,29,30,31,31,31,32,33,33,33,34,35,35,35,36,37,37,37,38,39,39,39 %N A249037 Number of even terms in first n terms of A249036. %p A249037 See A249036. %Y A249037 Cf. A249036, A249038. %K A249037 nonn %O A249037 1,3 %A A249037 _N. J. A. Sloane_, Oct 26 2014