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 A369424 #6 Jan 23 2024 08:40:32
%S A369424 1,2,2,3,6,10,14,18,23,32,48,72,104,144,192,249,320,416,552,744,1008,
%T A369424 1360,1816,2392,3105,3978,5050,6386,8082,10266,13098,16770,21506,
%U A369424 27562,35226,44819,56702,71298,89134,110898,137502,170146,210382,260178,321982,398786,494190,612466,758623,938480,1158768
%N A369424 Expansion of Sum_{n>=1} x^(n^2)*((1+x)/(1-x))^n.
%o A369424 (PARI) my(N=66,x='x+O('x^N)); Vec(sum(n=1,N,x^(n^2)*((1+x)/(1-x))^n))
%Y A369424 Cf. A369425.
%K A369424 nonn,easy
%O A369424 1,2
%A A369424 _Joerg Arndt_, Jan 23 2024