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 A107229 #7 Jul 03 2023 07:59:47
%S A107229 1,1,1,3,3,11,9,7,73,59,181,483,657,1871,3729,7027,16813,32699,68761,
%T A107229 149463,301017,642731,1349349,2790547,5912353,12327839,25777441,
%U A107229 54217443,113194077,237322091,497475369,1040614567,2181561193
%N A107229 a(n) = 2*a(n-2)+5*a(n-3), n>6.
%H A107229 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0, 2, 5).
%F A107229 G.f.: 6*x^4+2*x+(x^2+x-1)/(-1+2*x^2+5*x^3). [Sep 28 2009]
%t A107229 F[1] = 1; F[2] = 1; F[3] = 1; F[n__] := F[n] = 2*F[n - 2] - 5*F[n - 3] b = Table[Abs[F[n]], {n, 1, 50}]
%t A107229 LinearRecurrence[{0,2,5},{1,1,1,3,3,11,9,7},40] (* _Harvey P. Dale_, Jun 10 2019 *)
%Y A107229 Cf. A007493.
%K A107229 nonn,easy
%O A107229 0,4
%A A107229 _Roger L. Bagula_, Jun 08 2005
%E A107229 Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009