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 A345136 #4 Jun 09 2021 11:14:20
%S A345136 1,2,3,16,5,96,7,1184,261,1360,11,97428,13,24220,16395,15267456,17,
%T A345136 14474736,19,251423600,817971,7760236,23,264344406312,265675,
%U A345136 135208476,1223270127,971632668664,29,2584070688810,31,9176980861031424,2128920321,39671306896,48694835
%N A345136 a(1) = 1; a(n) = Sum_{d|n, d < n} binomial(n,d) * a(d).
%t A345136 a[1] = 1; a[n_] := a[n] = Sum[If[d < n, Binomial[n, d] a[d], 0], {d, Divisors[n]}]; Table[a[n], {n, 1, 35}]
%Y A345136 Cf. A008578 (fixed points), A056045, A074206, A330017.
%K A345136 nonn
%O A345136 1,2
%A A345136 _Ilya Gutkovskiy_, Jun 09 2021