OFFSET
1,2
FORMULA
a(n) = 2^(n-1) * A022915(n) = 2^(n-1) * (n*(n+1)/2)!/(1!*2!*...*n!)
CROSSREFS
KEYWORD
nonn
AUTHOR
Dan Fux (dan.fux(AT)OpenGaia.com or danfux(AT)OpenGaia.com), Sep 27 2001
EXTENSIONS
Corrected and extended by Vladeta Jovovic, Sep 28 2001
STATUS
approved