A374347 E.g.f. A(x) satisfies A(x) = A(x^3)^(1/3) * exp(3*x) with A(0)=1.

1, 3, 9, 33, 153, 783, 4329, 26757, 178929, 1385019, 13200489, 136901097, 1526386761, 18967459527, 242866024137, 3134483671437, 42179999959521, 579952188438003, 8370295687421001, 133701888662298801, 2247741025303683321, 39543420776223234303

Offset

0,2

Links

Table of n, a(n) for n=0..21.

Formula

E.g.f.: exp( 3 * Sum_{k>=0} x^(3^k)/3^k ).

Prog

(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))))

Crossrefs

Cf. A118396, A218003.

Sequence in context: A279840 A009220 A294035 * A007489 A294638 A201968

Adjacent sequences: A374344 A374345 A374346 * A374348 A374349 A374350

Keyword

nonn,easy

Author

Seiichi Manyama, Jul 05 2024

Status

approved