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 A341876 #6 Feb 22 2021 07:32:28
%S A341876 1,2,8,40,230,1584,12096,103828,975284,10045182,111724064,1342990356,
%T A341876 17288290776,238095398064,3488772309480,54304690352816,
%U A341876 894465560384026,15564259644205288,285282543243628356,5498843253154821196,111203939051325462504,2355689449259544720344
%N A341876 E.g.f.: Product_{i>=1, j>=1} (1 + x^(i*j)/(i*j)!) / (1 - x^(i*j)/(i*j)!).
%C A341876 Exponential convolution of A341505 and A341506.
%H A341876 Vaclav Kotesovec, <a href="/A341876/b341876.txt">Table of n, a(n) for n = 0..447</a>
%F A341876 a(n) = Sum_{k=0..n} binomial(n,k) * A341505(k) * A341506(n-k).
%F A341876 a(n) ~ c * n!, where c = 2*Product_{k>=2} ((k!+1)/(k!-1))^sigma_0(k) = 47.4139841600096613008093034069984807541890052309118213077603602425211186...
%t A341876 nmax = 25; CoefficientList[Series[Product[(1 + x^(i*j)/(i*j)!)/(1 - x^(i*j)/(i*j)!), {i, 1, nmax}, {j, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!
%t A341876 nmax = 25; CoefficientList[Series[Product[((1 + x^k/k!)/(1 - x^k/k!))^DivisorSigma[0, k], {k, 1, nmax}], {x, 0, nmax}], x]*Range[0, nmax]!
%Y A341876 Cf. A341505, A341506.
%K A341876 nonn
%O A341876 0,2
%A A341876 _Vaclav Kotesovec_, Feb 22 2021