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A362274 Expansion of e.g.f. 1/(1-x*exp(x*exp(x))). 3
1, 1, 4, 27, 232, 2465, 31416, 467173, 7940080, 151824177, 3225664720, 75386002901, 1921987809336, 53085088574713, 1578989028324904, 50320957240554645, 1710595789688360416, 61783832256587799137, 2362794061464082513440, 95380148553556615501717 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(n) = n! * Sum_{i=0..n} Sum_{j=0..n-i} i^j * j^(n-i-j) / (j! * (n-i-j)!).
PROG
(PARI) my(N=20, x='x+O('x^N)); Vec(serlaplace(1/(1-x*exp(x*exp(x)))))
CROSSREFS
Cf. A362245.
Sequence in context: A354588 A276029 A160883 * A328978 A185655 A181146
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Apr 13 2023
STATUS
approved

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Last modified May 24 23:50 EDT 2024. Contains 372782 sequences. (Running on oeis4.)