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 A363666 #12 Jul 12 2023 01:02:06
%S A363666 1,3,7,29,71,355,925,4425,13276,60111,184757,856357,2704157,12137147,
%T A363666 40367461,176999505,601080391,2616894901,9075135301,38884056181,
%U A363666 138014377810,583674491643,2104098963721,8823912454489,32247616479976,133998376789707
%N A363666 a(n) = Sum_{d|n} (n/d)^(d-1) * binomial(d+n-2,n-1).
%F A363666 a(n) = [x^n] Sum_{k>0} x^k/(1 - k*x^k)^n.
%t A363666 a[n_] := DivisorSum[n, (n/#)^(#-1) * Binomial[# + n - 2, n - 1] &]; Array[a, 25] (* _Amiram Eldar_, Jul 12 2023 *)
%o A363666 (PARI) a(n) = sumdiv(n, d, (n/d)^(d-1)*binomial(d+n-2, n-1));
%Y A363666 Cf. A167531, A363642, A363645.
%Y A363666 Cf. A332508, A363663, A363667.
%K A363666 nonn
%O A363666 1,2
%A A363666 _Seiichi Manyama_, Jun 14 2023