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 A216522 #11 Apr 08 2018 09:19:45
%S A216522 0,2,3,4,5,6,6,7,8,8,9,9,10,10,11,11,12,12,12,13,13,14,14,14,15,15,15,
%T A216522 16,16,16,17,17,17,18,18,18,18,19,19,19,20,20,20,20,21,21,21,21,22,22,
%U A216522 22,22,23,23,23,23,24,24,24,24,24,25,25,25,25,26,26,26
%N A216522 Integers of the form 2*x + 3*y with nonnegative x and y, with repetitions.
%C A216522 Not A086419: A086419(n)-a(n)={0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 1, -1, 0, 0}.
%C A216522 First differences occur at n = {48, 49, 56, 57, 61, 62, 65, 66}.
%H A216522 G. C. Greubel, <a href="/A216522/b216522.txt">Table of n, a(n) for n = 0..20000</a>
%t A216522 Sort[Flatten[Table[2*x+3*y,{x,0,100},{y,0,(100-2x)/3}]]]
%Y A216522 Cf. A086419.
%K A216522 nonn
%O A216522 0,2
%A A216522 _Zak Seidov_, Sep 08 2012