OFFSET
0,4
COMMENTS
The old entry with this sequence number was a duplicate of A072137.
FORMULA
a(n) ~ n^2 * (gamma + log(n))/2, where gamma is the Euler-Mascheroni constant A001620. - Vaclav Kotesovec, Dec 23 2020
MAPLE
f:=n->add(floor( n*(n-1)/(2*k) ), k=1..n );
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 28 2008
STATUS
approved