A354750 Expansion of e.g.f. 1 / (1 - log(1 + 3*x) / 3).

1, 1, -1, 6, -48, 534, -7542, 129240, -2603736, 60292512, -1577546928, 46021512096, -1480976147664, 52110720451152, -1990258155061776, 81995762243700864, -3624527727510038784, 171109526616468957312, -8591991935936929932672, 457246520477143117555968

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Formula

a(n) = Sum_{k=0..n} Stirling1(n,k) * k! * 3^(n-k).

a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * (k-1)! * (-3)^(k-1) * a(n-k).

Mathematica

nmax = 19; CoefficientList[Series[1/(1 - Log[1 + 3 x]/3), {x, 0, nmax}], x] Range[0, nmax]!
Table[Sum[StirlingS1[n, k] k! 3^(n - k), {k, 0, n}], {n, 0, 19}]

Prog

(PARI) my(x='x + O('x^20)); Vec(serlaplace(1/(1-log(1+3*x)/3))) \\ Michel Marcus, Jun 06 2022

Crossrefs

Cf. A006252, A087674, A255927, A335531, A352069, A354237, A354263, A354751.

Sequence in context: A368323 A002170 A153467 * A209670 A223270 A376323

Adjacent sequences: A354747 A354748 A354749 * A354751 A354752 A354753

Keyword

sign

Author

Ilya Gutkovskiy, Jun 06 2022

Status

approved