OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..338
FORMULA
Equals 2^n*A030019(n).
MAPLE
a:= n-> 2^n*`if`(n=0, 1, add(Stirling2(n-1, i)*n^(i-1), i=0...n-1)):
seq(a(n), n=0..18); # Alois P. Heinz, Aug 21 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Don Knuth, Jan 26 2008
STATUS
approved