OFFSET
0,4
COMMENTS
The sequence grows about as fast as x!*e^x/p(x), where p(x) is a quadratic.
EXAMPLE
For 3, by definition, a(0,3)=1 and a(1,3)=1, so a(2,3)=3*a(1,3)-a(0,3)=3-1=2 and a(3,3)=3*a(2,3)-a(1,3)=6-1=5, so the third element is 5
CROSSREFS
KEYWORD
nonn
AUTHOR
Nico Brown, Oct 23 2012
STATUS
approved