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 A265370 #6 Dec 18 2015 11:22:04 %S A265370 0,1,1,1,1,1,1,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,6,6,6,6,6,7, %T A265370 7,7,7,7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11, %U A265370 11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,14,14 %N A265370 a(0) = 0; for n >= 1, a(n) = A070939(A078510(n)). %C A265370 Number of significant bits in the binary representation of n-th Spironacci number, A078510(n). %H A265370 Antti Karttunen, <a href="/A265370/b265370.txt">Table of n, a(n) for n = 0..8192</a> %F A265370 a(0) = 0; for n >= 1, a(n) = A070939(A078510(n)). %o A265370 (define (A265370 n) (if (zero? n) n (A070939 (A078510 n)))) %Y A265370 Cf. A070939, A078510. %Y A265370 Cf. also A020909. %K A265370 nonn %O A265370 0,9 %A A265370 _Antti Karttunen_, Dec 16 2015