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 A346116 #5 Jul 05 2021 15:40:04
%S A346116 1,1,2,3,5,8,11,21,23,49,51,109,103,247,207,517,435,1086,871,2251,
%T A346116 1743,4631,3531,9365,7063,19081,14152,38369,28397,77299,56795,155289,
%U A346116 113591,311739,227387,624349,454885,1251509,909771,2504761,1819955,5014529,3639911,10033709,7279823
%N A346116 a(1) = a(2) = 1; a(n+2) = 1 + Sum_{d|n} a(n/d) * a(d).
%F A346116 G.f.: x + x^2 * (1/(1 - x) + Sum_{i>=1} Sum_{j>=1} a(i) * a(j) * x^(i*j)).
%t A346116 a[1] = a[2] = 1; a[n_] := a[n] = 1 + Sum[a[(n - 2)/d] a[d], {d, Divisors[n - 2]}]; Table[a[n], {n, 1, 45}]
%Y A346116 Cf. A144366, A277120, A339755.
%K A346116 nonn
%O A346116 1,3
%A A346116 _Ilya Gutkovskiy_, Jul 05 2021