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 A378276 #5 Nov 21 2024 16:05:32 %S A378276 1,0,0,0,1,0,6,7,19,9,61,88,226,377,945,1473,3427,6154,13758,25327, %T A378276 53967,102865,213345,411700,849706,1661885,3382821,6668577,13493719, %U A378276 26725414,53861446,107074403,215261971,428704177,860266725,1715950208,3439229842,6866462849 %N A378276 Cogrowth sequence of the 20-element dicyclic group Dic20 = <S,T | S^5, T^4, STST^3>. %F A378276 G.f.: (4*x^9-6*x^8-3*x^7-5*x^6-2*x^5-2*x^4-2*x^3-x^2+1) / ((2*x-1) * (2*x^2+2*x+1) * (x^2-x-1) * (4*x^4-2*x^3+3*x^2-x+1)). %Y A378276 Cf. A377656 (Dic12), A078789 (D10), A378254 (C10 X C2), A378278 (Frob20). %K A378276 nonn,easy %O A378276 0,7 %A A378276 _Sean A. Irvine_, Nov 21 2024