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 A287113 #4 May 22 2017 12:22:59
%S A287113 2,4,6,7,9,11,13,15,17,18,20,22,24,26,28,30,31,33,35,37,38,40,42,44,
%T A287113 46,48,50,51,53,55,57,59,61,62,64,66,68,70,72,74,75,77,79,81,83,85,86,
%U A287113 88,90,92,94,96,98,99,101,103,105,106,108,110,112,114,116
%N A287113 Positions of 0 in A287112.
%H A287113 Clark Kimberling, <a href="/A287113/b287113.txt">Table of n, a(n) for n = 1..10000</a>
%t A287113 s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {2, 0}, 2 -> 0}] &, {0}, 10] (* A287112 *)
%t A287113 Flatten[Position[s, 0]] (* A287113 *)
%t A287113 Flatten[Position[s, 1]] (* A287114 *)
%t A287113 Flatten[Position[s, 2]] (* A287115 *)
%Y A287113 Cf. A287112, A287114, A287115.
%K A287113 nonn,easy
%O A287113 1,1
%A A287113 _Clark Kimberling_, May 22 2017