OFFSET
0,4
EXAMPLE
G.f.: A(x) = 1 + x + x^2 + 2*x^3 + 5*x^4 + 18*x^5 + 84*x^6 +...
where both the exponential:
A(x) = exp(x + x^2/2 + 4*x^3/3 + 13*x^4/4 + 66*x^5/5 + 394*x^6/6 +...)
and the product:
A(x) = (1 + x)(1 + x^2)(1 + x^3)(1 + 4*x^4)(1 + 13*x^5)(1 + 66*x^6)*...
generate A(x) using the same coefficients (after initial term):
A157311=[1,1,1,4,13,66,394,2759,22005,198049,1979646,21776107,...].
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 10 2009
STATUS
approved