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 A368687 #6 Jan 03 2024 09:28:56
%S A368687 1,2,3,6,8,17,25,50,84,158,275,525,928,1731,3146,5818,10610,19611,
%T A368687 35891,66174,121442,223593,410745,756045,1389545,2556686,4700854,
%U A368687 8647799,15902592,29252734,53798081,98955914,181997878,334756388,615693506,1132456971,2082876104,3831042321,7046320314,12960268134
%N A368687 Expansion of g.f. Sum_{n>=1} q^n/(1-q^n-q^(2*n)-q^(3*n)).
%o A368687 (PARI) my(N=55,q='q+O('q^N)); Vec(sum(n=1,N,q^n/(1-q^n-q^(2*n)-q^(3*n))))
%Y A368687 Cf. A007435 (g.f. Sum{n>=1} q^n/(1-q^n-q^(2*n))), A368689 (g.f. Sum_{n>=1} q^n/(1-q^(2*n)-q^(3*n))), A368688 (g.f. Sum_{n>=1} q^n/(1-q^n-q^(3*n))).
%K A368687 nonn
%O A368687 1,2
%A A368687 _Joerg Arndt_, Jan 03 2024