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 A087437 #3 Mar 30 2012 17:29:08 %S A087437 1,1,1,1,2,3,2,4,4,3,3,6,5,4,7,9,11,5,12,11,12,5,12,17,6,17,23,17,15, %T A087437 19,26,8,25,35,22,35,32,25,40,10,39,36,39,32,61,30,52,48,43,57,12,73, %U A087437 51,16,68,52,92,38,94,72,82,81,15,119,69,59,131,84,93,140,50,72,123,143,101 %N A087437 A077565 indexed by A025487. %F A087437 a(n)=A077565(A025487(n)). %Y A087437 Cf. A025487, A077565. %K A087437 nonn %O A087437 1,5 %A A087437 _Ray Chandler_, Sep 03 2003