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 A373818 #10 Aug 04 2024 10:14:55
%S A373818 1,3,27,261,2592,26082,264384,2691954,27488403,281236779,2881239093,
%T A373818 29546332821,303201787140,3113043334560,31974807932820,
%U A373818 328518361498968,3376062893960244,34700713221307482,356719230542209212,3667432457788644762,37708163269636391982
%N A373818 Expansion of 1/(2 - 1/(1 - 9*x)^(1/3)).
%F A373818 a(n) = 9^n * Sum_{k>=0} (1/2)^(k+1) * binomial(n-1+k/3,n).
%o A373818 (PARI) my(N=30, x='x+O('x^N)); Vec(1/(2-1/(1-9*x)^(1/3)))
%Y A373818 Cf. A001027, A373939.
%K A373818 nonn,easy
%O A373818 0,2
%A A373818 _Seiichi Manyama_, Aug 04 2024