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 A191283 #7 Nov 17 2016 03:37:46
%S A191283 1,2,3,4,6,8,10,12,16,20,21,24,32,36,40,42,48,55,64,72,78,80,84,96,
%T A191283 110,128,136,144,156,160,168,192,210,220,231,256,272,288,300,312,320,
%U A191283 336,384,420,440,462,512,528,544,576,600,624,640,666,672,768,820,840,880,903,924,1024,1056,1088,1152,1176,1200,1248,1280,1332
%N A191283 Increasing sequence generated by these rules: a(1)=1, and if x is in a then 2x and x(x+1)/2 are in a.
%C A191283 See A191203.
%H A191283 Ivan Neretin, <a href="/A191283/b191283.txt">Table of n, a(n) for n = 1..10000</a>
%e A191283 1 -> 2 -> 3,4 -> 6,8,10 ->
%t A191283 g = 12; Union[Flatten[NestList[{2 #, (#^2 + #)/2} &, 1, g]]]
%t A191283 (* A191283; use g>10 to get all of first 60 terms *)
%Y A191283 Cf. A191203.
%K A191283 nonn
%O A191283 1,2
%A A191283 _Clark Kimberling_, May 29 2011