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 A109119 #9 Jul 22 2022 09:35:42 %S A109119 2,2662,59582,453962,2060602,6885902,18787862,44376082,94091762, %T A109119 183467702,334568302,577609562,952759082,1512116062,2321871302, %U A109119 3464647202,5042017762,7177208582,10017976862,13739671402,18548472602 %N A109119 a(n) = 2(5n^2 + 5n + 1)^3. %C A109119 Kekulé numbers for certain benzenoids. %D A109119 S. J. Cyvin and I. Gutman, Kekulé structures in benzenoid hydrocarbons, Lecture Notes in Chemistry, No. 46, Springer, New York, 1988 (p. 310). %F A109119 G.f.: 2(1 + 1324z + 20495z^2 + 46360z^3 + 20495z^4 + 1324z^5 + z^6)/(1-z)^7. %F A109119 a(n) = 2*A062786(n)^3. - _R. J. Mathar_, Jul 22 2022 %p A109119 a:=n->2*(5*n^2+5*n+1)^3: seq(a(n),n=0..28); %K A109119 nonn,easy %O A109119 0,1 %A A109119 _Emeric Deutsch_, Jun 19 2005