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 A013947 #15 Jul 27 2022 16:35:57 %S A013947 1,4,5,7,10,13,14,16,17,20,22,23,25,28,29,31,32,34,37,40,41,43,46,48, %T A013947 49,51,52,55,58,59,61,64,67,68,70,71,73,76,78,79,82,85,86,88,91,94,95, %U A013947 97,98,101,103,104,106,109,112,113,115,116,118,121,122,124,125,128,130,131,133 %N A013947 Positions of 1's in Kolakoski sequence (A000002). %F A013947 For n > 1, a(n) = A022297(n)+1. %Y A013947 Complement: A013948. %Y A013947 Cf. A000002, A022297, A156077. %K A013947 nonn,easy %O A013947 1,2 %A A013947 _Clark Kimberling_