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 A096750 #18 Jun 16 2024 13:05:08
%S A096750 1,1,1,1,2,4,6,7,8,12,21,33,44,55,76,119,185,263,351,480,706,1066,
%T A096750 1551,2156,2982,4269,6281,9162,13013,18252,25921,37513,54449,78045,
%U A096750 110626,157124,225490,325403,467576,666960,949661,1358381,1951976,2803811
%N A096750 Expansion of (1-x+x^2)/(1-2x+2x^2-x^3-x^4).
%H A096750 Harvey P. Dale, <a href="/A096750/b096750.txt">Table of n, a(n) for n = 0..1000</a>
%H A096750 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (2,-2,1,1).
%F A096750 a(n) = 2*a(n-1)-2*a(n-2)+a(n-3)+a(n-4).
%t A096750 CoefficientList[Series[(1-x+x^2)/(1-2x+2x^2-x^3-x^4),{x,0,50}],x] (* or *) LinearRecurrence[ {2,-2,1,1},{1,1,1,1},50] (* _Harvey P. Dale_, Jun 16 2024 *)
%Y A096750 Cf. A003522.
%K A096750 nonn,easy
%O A096750 0,5
%A A096750 _Paul Barry_, Jul 07 2004