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 A135248 #20 Sep 08 2022 08:45:32
%S A135248 0,0,0,1,4,12,32,82,208,528,1344,3428,8752,22352,57088,145800,372352,
%T A135248 950912,2428416,6201616,15837504,40445376,103288320,263775008,
%U A135248 673621760,1720277760,4393200640,11219241536,28651407104,73169217792,186857644032,477192188032
%N A135248 a(n) = 4*a(n-1) - 4*a(n-2) + 2*a(n-4), with a(0)=a(1)=a(2)=0, and a(3)=1.
%C A135248 The inverse binomial transform is {0, 0, 0, 1, 0, 2, 0, 5, 0, 12, 0, 29, ...} (n>=0), an aerated variant of A000129. - _R. J. Mathar_, Jul 10 2019
%H A135248 Colin Barker, <a href="/A135248/b135248.txt">Table of n, a(n) for n = 0..1000</a>
%H A135248 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-4,0,2).
%F A135248 G.f.: x^3 / (1-4*x+4*x^2-2*x^4). - _Colin Barker_, Apr 08 2016
%p A135248 seq(coeff(series(x^3/(1-4*x+4*x^2-2*x^4), x, n+1), x, n), n = 0 ..35); # _G. C. Greubel_, Nov 21 2019
%t A135248 LinearRecurrence[{4,-4,0,2}, {0,0,0,1}, 35] (* _G. C. Greubel_, Oct 04 2016 *)
%o A135248 (PARI) concat(vector(3), Vec(x^3/(1-4*x+4*x^2-2*x^4) + O(x^35))) \\ _Colin Barker_, Apr 08 2016
%o A135248 (Magma) R<x>:=PowerSeriesRing(Integers(), 30); Coefficients(R!( x^3/(1-4*x+4*x^2-2*x^4) )); // _G. C. Greubel_, Nov 21 2019
%o A135248 (Sage)
%o A135248 def A135248_list(prec):
%o A135248 P.<x> = PowerSeriesRing(ZZ, prec)
%o A135248 return P(x^3/(1-4*x+4*x^2-2*x^4)).list()
%o A135248 A135248_list(30) # _G. C. Greubel_, Nov 21 2019
%o A135248 (GAP) a:=[0,0,0,1];; for n in [5..35] do a[n]:=4*a[n-1]-4*a[n-2]+ 2*a[n-4]; od; a; # _G. C. Greubel_, Nov 21 2019
%Y A135248 Cf. A101893 (first differences).
%K A135248 nonn,easy
%O A135248 0,5
%A A135248 _Paul Curtz_, Feb 15 2008