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 A095129 #7 Nov 07 2016 14:46:19
%S A095129 0,1,1,15,45,231,861,3655,14365,58311,232221,932295,3725085,14913991,
%T A095129 59639581,238612935,954386205,3817763271,15270790941,61084037575,
%U A095129 244335101725,977343902151,3909371414301,15637499638215,62549981775645
%N A095129 Jac(n)(2Jac(n)-1).
%C A095129 mod(a(n),3)=A095130(n)
%H A095129 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (4,5,-20,-4,16).
%F A095129 G.f. : x(1-3x+6x^2)/((1-x^2)(1-4x)(1-4x^2)); a(n)=2(4^n+1)/9-4(-2)^n/9-2^n/3+(-1)^n/3.
%t A095129 LinearRecurrence[{4,5,-20,-4,16},{0,1,1,15,45},30] (* _Harvey P. Dale_, Nov 07 2016 *)
%Y A095129 Cf. A001045.
%K A095129 easy,nonn
%O A095129 0,4
%A A095129 _Paul Barry_, May 29 2004