OFFSET
1,7
FORMULA
for n>=43 a(n) = (1/2)*(n^2 - 3*n - 8 )
PROG
(PARI) a(n)=sum(i=1, n, sum(j=1, i, if(sign(1/i+1/j+1/n-1/2)+1, 0, 1)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Dec 08 2002
STATUS
approved