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 A054129 #7 Apr 02 2024 10:41:12 %S A054129 2,9,39,134,394,1040,2542,5876,13039,28080,59163,122694,251576,511720, %T A054129 1035068,2085640,4191629,8409592,16852833,33748170,67549470,135164720, %U A054129 270410170,540918620,1081955995,2164054496 %N A054129 T(n,3), array T as in A054126. %H A054129 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (8, -27, 50, -55, 36, -13, 2). %F A054129 G.f.: x^3(-x^7+7x^6-21x^5+35x^4-35x^3+21x^2-7x+2)/[(1-2x)(1-x)^6]. %K A054129 nonn %O A054129 3,1 %A A054129 _Clark Kimberling_