OFFSET
0,5
EXAMPLE
a(3) = 1 because there is only 1 triangle on the integer lattice Z*Z where the square of the longest side is equal to A001481(3) = 4; its a triangle with sides 2, sqrt(2), sqrt(2).
CROSSREFS
KEYWORD
nonn
AUTHOR
Franz Vrabec, Sep 27 2004
STATUS
approved