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 A373713 #12 Aug 04 2024 10:15:13
%S A373713 1,3,0,18,-81,567,-3888,28188,-209952,1600398,-12417786,97750152,
%T A373713 -778646358,6264403434,-50826308652,415388851020,-3416382463113,
%U A373713 28254462711543,-234821716366914,1960141044056202,-16426217919609621,138140613244558143,-1165452696039219804
%N A373713 Expansion of 1/(2 - (1 + 9*x)^(1/3)).
%F A373713 a(n) = 9^n * Sum_{k>=0} (1/2)^(k+1) * binomial(k/3,n).
%o A373713 (PARI) my(N=30, x='x+O('x^N)); Vec(1/(2-(1+9*x)^(1/3)))
%Y A373713 Cf. A001019, A373714.
%K A373713 sign,easy
%O A373713 0,2
%A A373713 _Seiichi Manyama_, Aug 04 2024