OFFSET
1,11
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
FORMULA
G.f.: Sum(x^(n^2+3*n)/(1-x^n),n = 1 .. infinity). - Vladeta Jovovic, May 13 2008
EXAMPLE
n=25 = 2*23+2-23 = 3*11+3-11 = 4*7+4-7, therefore a(25)=3.
PROG
(Haskell)
a081757 n = length [() | j <- [2..n], i <- [1..j-1], i * j + i - j == n]
-- Reinhard Zumkeller, May 24 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Apr 08 2003
STATUS
approved