OFFSET
1,3
COMMENTS
The next term has 154 decimal digits.
FORMULA
a(n) = Sum(Stirling1(n, k)*A007537(k), k=1..n).
a(n) = Sum((2*Stirling1(n+1, k+1)-Stirling1(n, k))*2^(2^k-2), k=0..n).
PROG
(PARI)
a(n)=sum(k=0, n, (2*stirling(n+1, k+1, 1) - stirling(n, k, 1 )) * 2^(2^k-2) );
vector(10, n, a(n)) /* show terms */
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Goran Kilibarda, Vladeta Jovovic, Jun 04 2004
STATUS
approved