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 A054128 #7 Apr 02 2024 10:40:15 %S A054128 2,7,24,68,171,398,880,1880,3925,8070,16426,33216,66887,134334,269348, %T A054128 539512,1079993,2161126,4323582,8648704,17299179,34600382,69203064, %U A054128 138408728,276820381,553644038,1107291730,2214587520 %N A054128 T(n,2), array T as in A054126. %H A054128 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (6, -14, 16, -9, 2). %F A054128 G.f.: x^2(-x^5+5x^4-10x^3+10x^2-5x+2)/[(1-2x)(1-x)^4]. %K A054128 nonn %O A054128 2,1 %A A054128 _Clark Kimberling_