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A346967
E.g.f.: exp( exp(x + x^2/2) - 1 ).
1
1, 1, 3, 11, 51, 277, 1733, 12175, 94741, 806613, 7446655, 73987135, 786304687, 8892165193, 106533442265, 1346989228595, 17913994025657, 249858226648121, 3645308254213291, 55501016954601443, 879999480695941467, 14502890818339130061, 248009589165030244029
OFFSET
0,3
FORMULA
a(0) = 1; a(n) = Sum_{k=1..n} binomial(n-1,k-1) * A000085(k) * a(n-k).
MATHEMATICA
nmax = 22; CoefficientList[Series[Exp[Exp[x + x^2/2] - 1], {x, 0, nmax}], x] Range[0, nmax]!
CROSSREFS
Sequence in context: A326519 A127784 A112696 * A192925 A350354 A132006
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Aug 09 2021
STATUS
approved