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 A028602 #5 Jul 08 2025 18:39:29 %S A028602 1,0,4,0,4,8,0,16,4,8,24,16,0,16,32,0,4,24,24,16,24,0,48,32,0,48,56, %T A028602 32,32,40,0,48,4,0,72,64,24,64,80,0,24,56,0,48,48,48,96,64,0,64,124,0, %U A028602 56,72,96,96,32,0,120,80,0,64 %N A028602 Expansion of (theta_3(z)*theta_3(9z)+theta_2(z)*theta_2(9z))^2. %K A028602 nonn %O A028602 0,3 %A A028602 _N. J. A. Sloane_