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 A286270 #4 May 05 2017 10:08:15 %S A286270 0,0,0,0,0,0,0,1,0,0,1,1,2,5,6,7,14,19,28,42,62,92,132,187,272,418, %T A286270 595,873,1272,1856,2705,3945,5735,8333,12218 %N A286270 A282133(n)/2. %Y A286270 Cf. A282133. %K A286270 nonn,more %O A286270 1,13 %A A286270 _N. J. A. Sloane_, May 05 2017