OFFSET
0,2
FORMULA
a(n) ~ (pi/2)^2 * 10^n + O(10^(n/2)). This follows from the formula given in A056911: A056911(n) ~ n * (3/2) * zeta(2) + O(n^(1/2)) = n * (3/2) * (pi^2 / 6) + O(n^(1/2)). - M. F. Hasler
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Sep 24 2010
EXTENSIONS
a(10)-a(18) from Max Alekseyev, Sep 24 2010
Edited by N. J. A. Sloane, Sep 24 2010
STATUS
approved