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 A378031 #6 Nov 16 2024 16:24:34 %S A378031 1,1,2,85,926,5461,37130,349525,2973350,22369621,174174002,1431655765, %T A378031 11582386286,91625968981,729520967450,5864062014805,47006639297270, %U A378031 375299968947541,2999857885752002,24019198012642645,192222214478506046,1537228672809129301 %N A378031 Cogrowth sequence for the 18-element group C6 X C3 = <S,T | S^6, T^3, [S,T]>. %C A378031 Sequence gives terms for n = 0 (mod 3), all other terms are 0. %F A378031 G.f.: (36*x^4+99*x^3-14*x^2+6*x-1) / ((8*x-1) * (x+1) * (27*x^2+1)). %Y A378031 Cf. A095364 (D9), A377627 (C6 X C2), A007613 (C3 X C3), A378109 (S3 X C3), A378110 (S3:C3). %K A378031 nonn,easy %O A378031 0,3 %A A378031 _Sean A. Irvine_, Nov 14 2024