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 A188477 #11 May 29 2021 12:42:10
%S A188477 1,1,1,-8,-25,-25,-17,32,81,81,49,-72,-169,-169,-97,128,289,289,161,
%T A188477 -200,-441,-441,-241,288,625,625,337,-392,-841,-841,-449,512,1089,
%U A188477 1089,577,-648,-1369,-1369,-721,800,1681
%N A188477 Expansion of (1+x+x^2)*(1-8*x^3-14*x^4+8*x^7+x^8)/(1+x^4)^3.
%C A188477 a(n+1) is the Hankel transform of A188476.
%H A188477 <a href="/index/Rec#order_12">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,-3,0,0,0,-3,0,0,0,-1).
%t A188477 CoefficientList[Series[(1+x+x^2)(1-8x^3-14x^4+8x^7+x^8)/(1+x^4)^3,{x,0,50}],x] (* or *) LinearRecurrence[{0,0,0,-3,0,0,0,-3,0,0,0,-1},{1,1,1,-8,-25,-25,-17,32,81,81,49,-72},50] (* _Harvey P. Dale_, May 29 2021 *)
%K A188477 sign,easy
%O A188477 0,4
%A A188477 _Paul Barry_, Apr 01 2011