OFFSET
0,3
FORMULA
From Vaclav Kotesovec, Dec 23 2020: (Start)
a(n) ~ 2*n * (log(2*n) + 2*gamma - 2), where gamma is the Euler-Mascheroni constant A001620. (End)
MATHEMATICA
Table[Sum[Floor[(2 n - i)/i], {i, n}], {n, 0, 60}]
PROG
(PARI) a(n) = sum(k=1, n, (2*n-k)\k); \\ Michel Marcus, Dec 22 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Dec 22 2020
STATUS
approved