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 A286293 #14 May 26 2017 09:37:54 %S A286293 1,2,4,11,17,12,14,16,29,35,24,26,28,30,32,53,59,40,42,44,46,48,50,52, %T A286293 54,56,58,60,62,98,104,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98, %U A286293 100,102,104,161,167,112,114,116,118,120,122,124,126,128,130,132,134,136 %N A286293 A compressed version of A286290. %H A286293 Ray Chandler, <a href="/A286293/b286293.txt">Table of n, a(n) for n = 1..971</a> %e A286293 Start with A064736, bisect to get A286290, take second difference, and we get: %e A286293 1, 2, 7, 6, -5, 2, 2, 13, 6, -11, 2, 2, 2, 2, 21, 6, -19, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 36, 6, -34, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 57, 6, -55, 2, 2, ... %e A286293 which appears to consist of runs of 2's separated by a triple of numbers. %e A286293 Look at the runs in that sequence: %e A286293 1, 1, 1, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 11, 1, 1, 1, 17, 1, 1, 1, 12, 1, 1, 1, 14, 1, 1, 1, 16, 1, 1, 1, 29, 1, 1, 1, 35, 1, 1, 1, 24, 1, 1, 1, 26, 1, 1, ... %e A286293 and take the 4i+2 subsequence, which gives the present sequence. %Y A286293 Cf. A064736, A286290, A286291, A286292. %K A286293 nonn %O A286293 1,2 %A A286293 _N. J. A. Sloane_, May 23 2017