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 A173435 #9 Jul 28 2015 16:43:16
%S A173435 8,-6,12,-25,52,-106,212,-420,832,-1656,3312,-6640,13312,-26656,53312,
%T A173435 -106560,212992,-425856,851712,-1703680,3407872,-6816256,13632512,
%U A173435 -27264000,54525952,-109049856,218099712,-436203520,872415232,-1744838656,3489677312,-6979338240
%N A173435 Inverse binomial transform of A143025, assuming offset zero there.
%C A173435 Inverse binomial transform of 8, 2, 8, 1, 8, 2 ,8, 1,... with a(0)=8, a(1)=2 etc.
%H A173435 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (-4, -6, -4).
%F A173435 a(n)= -4*a(n-1) -6*a(n-2) -4*a(n-3), n>3. G.f.: (26*x+36*x^2+19*x^3+8)/( (2*x+1) * (2*x^2+2*x+1)). [R. J. Mathar, Mar 10 2010]
%F A173435 a(n+1) +2*a(n) = (-1)^(n+1)*A009545(n-1), n > 0.
%t A173435 Join[{8},LinearRecurrence[{-4,-6,-4},{-6,12,-25},40]] (* _Harvey P. Dale_, Sep 25 2013 *)
%K A173435 sign
%O A173435 0,1
%A A173435 _Paul Curtz_, Feb 18 2010
%E A173435 Extended by _R. J. Mathar_, Mar 10 2010