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 A366034 #21 Oct 04 2023 12:45:33
%S A366034 1,4,15,70,405,2676,19075,142562,1100961,8711968,70257055,575269278,
%T A366034 4769615773,39961571228,337805166747,2877506096794,24675158973081,
%U A366034 212835736433304,1845348003175063,16073746202176150,140590118902532757,1234285061013293716
%N A366034 G.f. A(x) satisfies A(x) = 1/(1 - x)^3 + x*(1 - x)^3*A(x)^3.
%F A366034 a(n) = Sum_{k=0..n} binomial(n+2*k+2,n-k) * binomial(3*k,k)/(2*k+1).
%o A366034 (PARI) a(n) = sum(k=0, n, binomial(n+2*k+2, n-k)*binomial(3*k, k)/(2*k+1));
%Y A366034 Cf. A014140, A164965, A366215.
%Y A366034 Cf. A366184.
%K A366034 nonn
%O A366034 0,2
%A A366034 _Seiichi Manyama_, Oct 04 2023