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 A374347 #8 Jul 05 2024 10:07:34
%S A374347 1,3,9,33,153,783,4329,26757,178929,1385019,13200489,136901097,
%T A374347 1526386761,18967459527,242866024137,3134483671437,42179999959521,
%U A374347 579952188438003,8370295687421001,133701888662298801,2247741025303683321,39543420776223234303
%N A374347 E.g.f. A(x) satisfies A(x) = A(x^3)^(1/3) * exp(3*x) with A(0)=1.
%F A374347 E.g.f.: exp( 3 * Sum_{k>=0} x^(3^k)/3^k ).
%o A374347 (PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(3*sum(k=0, ceil(log(N+1)/log(3)), x^3^k/3^k))))
%Y A374347 Cf. A118396, A218003.
%K A374347 nonn,easy
%O A374347 0,2
%A A374347 _Seiichi Manyama_, Jul 05 2024