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 A318123 #5 Aug 22 2018 02:32:18
%S A318123 1,1,1,2,3,6,11,22,42,90,165,364,710,1586,2885,6288,12546,28686,55406,
%T A318123 130284,261016,555716,1149559,2552096,5429610,11510594,23650462,
%U A318123 54063580,109053128,262968892,501771275,1192348336,2635608642,5766609158,11935917602,28867050172,58702673480
%N A318123 a(0) = a(1) = 1; a(n) = Sum_{k=0..n-2} lcm(a(k), a(n-k-2)).
%H A318123 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%t A318123 a[0] = a[1] = 1; a[n_] := a[n] = Sum[LCM[a[k], a[n - k - 2]], {k, 0, n - 2}]; Table[a[n], {n, 0, 36}]
%Y A318123 Cf. A007463, A007477, A318122.
%K A318123 nonn
%O A318123 0,4
%A A318123 _Ilya Gutkovskiy_, Aug 18 2018