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 A136441 #4 Mar 31 2012 20:25:00 %S A136441 2,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,3,1,1,1,1,1,2,1,1,1,1,1,1, %T A136441 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, %U A136441 2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,4,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 %N A136441 Number of rotational symmetries in the binary expansion of a number with 0 appended to the front. %H A136441 Gary Doran, <a href="/A136441/b136441.txt">Table of n, a(n) for n = 0..100</a> %e A136441 a(0) = 2 because 00 has two rotational symmetries; a(21) = 3 because 010101 has 3 rotational symmetries. %Y A136441 Cf. A138904. %K A136441 base,easy,nonn %O A136441 0,1 %A A136441 _Max Sills_, Apr 03 2008