OFFSET
0,3
FORMULA
Logarithmic derivative yields A228647.
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 13*x^3 + 128*x^4 + 2974*x^5 + 161048*x^6 +...
where
log(A(x)) = x + 5*x^2/2 + 31*x^3/3 + 453*x^4/4 + 14131*x^5/5 + 946781*x^6/6 + 136250983*x^7/7 +...+ A001609(n^2)*x^n/n +...
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Aug 28 2013
STATUS
approved