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 A028659 #14 Jul 08 2025 18:44:42 %S A028659 1,6,12,8,6,24,36,48,72,78,120,120,116,264,240,240,342,288,496,360, %T A028659 504,480,600,390,748,678,804,548,1008,552,1200,840,1344,1200,1440, %U A028659 1056,1978,1368,1800,1764,2040,1800,2400,1848,2520,2184,2364,1656,3176,2406,2940 %N A028659 Expansion of (theta_3(z)*theta_3(23z) + theta_2(z)*theta_2(23z))^3. %H A028659 Jinyuan Wang, <a href="/A028659/b028659.txt">Table of n, a(n) for n = 0..1000</a> %o A028659 (PARI) a(n) = polcoeff((1 + 2*x*Ser(qfrep([2, 1; 1, 12], n, 1)))^3, n); \\ _Jinyuan Wang_, Feb 19 2020 %Y A028659 Cf. A028658, A028660, A328093, A328094. %K A028659 nonn %O A028659 0,2 %A A028659 _N. J. A. Sloane_ %E A028659 More terms from _Jinyuan Wang_, Feb 19 2020