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 A327690 #13 Sep 23 2019 07:21:50 %S A327690 1,1,2,3,6,8,14,19,31,43,64,88,131,176,250,337,471,626,859,1133,1532, %T A327690 2008,2674,3479,4595,5933,7745,9952,12888,16451,21142,26842,34260, %U A327690 43283,54878,68993,87017,108884,136564,170191,212441,263646,327616,405034,501203,617423,760964 %N A327690 Expansion of Product_{k>=1} B(x^k), where B(x) is the g.f. of A003114. %H A327690 Vaclav Kotesovec, <a href="/A327690/b327690.txt">Table of n, a(n) for n = 0..10000</a> (terms 0..1000 from Seiichi Manyama) %F A327690 G.f.: Product_{i>=1} Product_{j>=1} 1 / ((1-x^(i*(5*j-1))) * (1-x^(i*(5*j-4)))). %t A327690 nmax = 50; CoefficientList[Series[Product[1/(QPochhammer[x^(5*j - 4)] * QPochhammer[x^(5*j - 1)]), {j, 1, nmax}], {x, 0, nmax}], x] (* _Vaclav Kotesovec_, Sep 23 2019 *) %Y A327690 Cf. A003114, A327688, A327691. %K A327690 nonn %O A327690 0,3 %A A327690 _Seiichi Manyama_, Sep 22 2019