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 A054132 #9 May 30 2022 08:24:47
%S A054132 3,13,68,394,2396,14925,94248,600498,3851012,24821845,160646528,
%T A054132 1043245180,6794418992,44360061964,290244849376
%N A054132 T(2n+1,n), array T as in A054126.
%F A054132 a(n) = A052509(4*n+2,3*n+2) + A052509(4*n+2,n+1) = 2^n + Sum_{m=0..n+1} binomial(3*n+1,m). - _Jianing Song_, May 30 2022
%o A054132 (PARI) a(n) = 2^n + sum(m=0, n+1, binomial(3*n+1,m)) \\ _Jianing Song_, May 30 2022
%K A054132 nonn
%O A054132 0,1
%A A054132 _Clark Kimberling_