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 A158095 #4 Oct 07 2020 08:43:49
%S A158095 1,2,5,14,61,370,3454,40880,614346,10848514,222870183,5175100204,
%T A158095 134514302384,3859406052466,121274242936381,4139268759072626,
%U A158095 152532132931199062,6034430112251517608,255114747410233804986
%N A158095 G.f.: A(x) = exp( Sum_{n>=1} 2*sigma(n,n-1)*x^n/n ).
%e A158095 G.f.: A(x) = 1 + 2*x + 5*x^2 + 14*x^3 + 61*x^4 + 370*x^5 +...
%o A158095 (PARI) a(n)=polcoeff(exp(sum(m=1,n,2*sigma(m,m-1)*x^m/m)+x*O(x^n)),n)
%Y A158095 Cf. A023881, A294645.
%K A158095 nonn
%O A158095 0,2
%A A158095 _Paul D. Hanna_, Mar 20 2009