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 A213712 #12 Nov 05 2012 13:55:17 %S A213712 0,1,2,1,3,1,3,4,1,3,4,3,5,1,3,4,3,4,3,4,4,6,1,3,4,3,4,3,4,4,5,3,4,3, %T A213712 5,3,4,4,7,1,3,4,3,4,3,4,4,5,3,4,3,5,3,4,4,6,3,4,3,5,4,6,6,4,6,5,4,7, %U A213712 8,1,3,4,3,4,3,4,4,5,3,4,3,5,3,4,4,6,3,4,3,5,4,6,6,4,6,5,4,7,7,3,4,3,5,4,6,6,4,6,5,4,6,7,4,6,5,4,6,6,4,7 %N A213712 a(n) = A000120(A179016(n)). %C A213712 Also the first differences of A179016, shifted once right (prepended with zero). %H A213712 Antti Karttunen, <a href="/A213712/b213712.txt">Table of n, a(n) for n = 0..16405</a> %Y A213712 Cf. A213718. %K A213712 nonn %O A213712 0,3 %A A213712 _Antti Karttunen_, Oct 26 2012 %E A213712 Offset changed from 1 to 0 by _Antti Karttunen_, Nov 05 2012