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 A377735 #30 Nov 12 2024 12:22:24 %S A377735 1,1,7,103,829,7261,66595,598627,5377849,48426745,435876607, %T A377735 3922582687,35303534581,317733991381,2859598948507,25736384863003, %U A377735 231627537879409,2084647743751921,18761829221081335,168856464809568727,1519708183900618669,13677373637498037325 %N A377735 Cogrowth sequence of the 16-element group Q8 X C2 = <S,T,U | S^4, T^4, U^2, STS^3T, S^2U^2, [S,U], [T,U]>. %C A377735 Gives the even terms, all the odd terms are 0. %H A377735 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (8, 2, 72, -81). %F A377735 G.f.: (27*x^3+3*x^2+7*x-1) / ((1-x) * (9*x-1) * (9*x^2+2*x+1)). %Y A377735 Cf. A047854 (D4 X C2), A377840 (C8 X C2), A071930 (Q8). %K A377735 nonn,easy %O A377735 0,3 %A A377735 _Sean A. Irvine_, Nov 10 2024