Generalized Bell Numbers - Correction
Paul D. Hanna
pauldhanna at juno.com
Thu Aug 11 06:59:56 CEST 2005
Seqfans -
Correction - since sequences A080093 and A080094 are numerators
of coefficients, and to state the e.g.f.s so as to remove the powers of 2
in the denominators of the coefficients, I should have written:
A080093 (after multiplying A080093(3*k+1) by 2, for k>=0),
{0,0,1,1,4,11,41,162,715,3425,17722,98253,...}:
E.g.f.: exp(exp(x) - 1 - x) - 1
A080094 (after multiplying A080094(3*k+1) by 2, for k>=0),
{0,2,-3,3,-2,3,-5,-4,-5,55,212,201,...}:
E.g.f.: 1 - exp(1 - x - exp(x))
instead of the statements below.
Yet the formulas below are correct for evaluating Benoits' sums,
which of course include the powers of 2 in the denominators.
Paul
A080093 (after multiplying A080093(3*k+1) by 2, for k>=0):
E.g.f.: (exp(exp(x/2) - 1 - x/2) - 1)/2
A080094 (after multiplying A080094(3*k+1) by 2, for k>=0):
E.g.f.: (1 - exp(1 - x/2 - exp(x/2)))/2
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