OFFSET
0,2
FORMULA
a(n) = (3^n-1)(3^n-3)...(3^n-3^(n-1))/n!.
From Geoffrey Critzer, Sep 27 2022: (Start)
Sum_{n>=0} a(n)*x^n/A053290(n) = exp(x).
a(n) = A053290(n) / n!. (End)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Apr 05 2000
STATUS
approved