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 A378110 #4 Nov 16 2024 16:08:44 %S A378110 1,0,1,2,5,10,53,98,397,1058,3341,9658,30053,87386,267877,793682, %T A378110 2397437,7162066,21552125,64506026,193839445,580889738,1743836117, %U A378110 5229312706,15692323949,47067796610,141222563821,423628907162,1270962692165,3812740639930 %N A378110 Cogrowth sequence of the 18-element group S3:C3 = <S,T,U | S^3, T^3, U^2, (SU)^2, (TU)^2, [S,T]>. %C A378110 Also called: C3^2:C2. Gap identifier 18, 4. %F A378110 G.f.: (6*x^5-4*x^4-8*x^3-5*x^2+1) / ((x-1) * (3*x-1) * (2*x+1) * (3*x^2+2*x+1)). %Y A378110 Cf. A095364 (D9), A378031 (C6 X C3), A378109 (S3 X C3), A001045 (S3). %K A378110 nonn,easy %O A378110 0,4 %A A378110 _Sean A. Irvine_, Nov 16 2024