OFFSET
1,3
EXAMPLE
a(4) = H(1)*3! + H(2)*2! = 1*6+(3/2)*2 = 6+3 = 9.
MAPLE
H:=k->sum(1/j, j=1..k): a:=n->sum(H(k)*(n-k)!, k=1..floor(n/2)): seq(a(n), n=1..24); # Emeric Deutsch, Feb 03 2006
PROG
(PARI) a(n) = sum(k=1, n\2, sum(j=1, k, 1/j)*(n-k)!); \\ Michel Marcus, Aug 15 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Aug 09 2005
EXTENSIONS
More terms from Emeric Deutsch, Feb 03 2006
STATUS
approved