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 A377944 #6 Nov 12 2024 12:20:35 %S A377944 1,0,1,12,28,120,544,2016,8128,33024,130816,523776,2099200,8386560, %T A377944 33550336,134234112,536854528,2147450880,8590065664,34359607296, %U A377944 137438691328,549756862464,2199022206976,8796090925056,35184380477440,140737479966720,562949936644096 %N A377944 Cogrowth sequence of the 16-element dicyclic group Q16 = <S,T | S^8, T^4, (ST)^4, TST^3S>. %C A377944 Gives the even terms, all the odd terms are 0. %C A377944 Also called Dic16, C8:C2. Gap identifier 16, 9. %H A377944 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2, 4, 16). %F A377944 G.f.: (6*x^3+3*x^2+2*x-1) / ((4*x-1) * (4*x^2+2*x+1)). %Y A377944 Cf. A071930 (Q8), A377656 (Dic12), A377735 (Q8 X C2), A377840 (C8 X C2), A007582 (D8), A377885 (SD16), A377883 (M4(2)). %K A377944 nonn,easy %O A377944 0,4 %A A377944 _Sean A. Irvine_, Nov 11 2024