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 A347893 #18 Sep 19 2021 11:31:56
%S A347893 1,1,2,9,30,195,1545,12474,95564,1199397,14287845,167518846,
%T A347893 2341450386,34489552331,540927170147,10114629115798,175935142966408,
%U A347893 3184271322683385,68623817313870153,1442553498798565142,31856896467060026670,787164874800260366287,19097783293834170329239
%N A347893 E.g.f.: Product_{k>=1} (1 + x^k)^cos(x).
%F A347893 E.g.f.: exp( cos(x) * Sum_{k>=1} x^k / (k*(1 - x^(2*k))) ). - _Ilya Gutkovskiy_, Sep 18 2021
%F A347893 E.g.f.: exp( cos(x) * Sum_{k>=1} A000593(k)*x^k/k ). - _Seiichi Manyama_, Sep 18 2021
%o A347893 (PARI) N=40; x='x+O('x^N); Vec(serlaplace(prod(k=1, N, (1+x^k)^cos(x))))
%o A347893 (PARI) N=40; x='x+O('x^N); Vec(serlaplace(exp(cos(x)*sum(k=1, N, sigma(k>>valuation(k, 2))*x^k/k))))
%Y A347893 Cf. A000593, A265024, A346941, A347817, A347894, A347899.
%K A347893 nonn
%O A347893 0,3
%A A347893 _Seiichi Manyama_, Sep 18 2021