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 A285376 #4 Apr 26 2017 21:43:33
%S A285376 2,4,6,7,9,11,13,14,16,18,20,21,23,24,26,28,30,31,33,35,37,38,40,42,
%T A285376 44,45,47,48,50,52,54,55,57,59,61,62,64,66,68,69,71,72,74,76,78,79,81,
%U A285376 82,84,86,88,89,91,93,95,96,98,100,102,103,105,106,108,110
%N A285376 (A285374)/2.
%H A285376 Clark Kimberling, <a href="/A285376/b285376.txt">Table of n, a(n) for n = 1..10000</a>
%t A285376 s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {1, 1, 1, 0}}] &, {0}, 10] (* A285373 *)
%t A285376 t = Flatten[Position[s, 0]] (* A285374 *)
%t A285376 t/2 (* A285376)
%Y A285376 Cf. A284373, A285374.
%K A285376 nonn,easy
%O A285376 1,1
%A A285376 _Clark Kimberling_, Apr 26 2017