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 A284518 #15 Oct 18 2017 18:01:26 %S A284518 1,10,9,16,1,18,1,16,9,10,1,24,1,10,9,16,1,18,1,16,9,10,1,24,1,10,9, %T A284518 16,1,18,1,16,9,10,1,24,1,10,9,16,1,18,1,16,9,10,1,24,1,10,9,16,1,18, %U A284518 1,16,9,10,1,24,1,10,9,16,1,18,1,16,9,10,1,24,1,10,9,16,1,18,1,16 %N A284518 Periodic with period [1, 10, 9, 16, 1, 18, 1, 16, 9, 10, 1, 24] of length 12. %H A284518 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,0,1,1,1). %F A284518 a(n+12)=a(n). %F A284518 G.f.: -x*(1+11*x+20*x^2+35*x^3+25*x^4+24*x^5) / ( (x-1)*(1+x)*(1+x+x^2)*(x^2+1) ). - _R. J. Mathar_, Mar 28 2017 %Y A284518 Row 4 of A008307. %Y A284518 Cf. A284517. %K A284518 nonn,easy %O A284518 1,2 %A A284518 _R. J. Mathar_, Mar 28 2017