OFFSET
1,2
COMMENTS
Permutations of the 3 points are not counted separately.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..100
EXAMPLE
a(2) = 2 because there are 8 triples of collinear points in the square [0 2] X [0 2]: The 2*3 lines of x=0,1,2 and y=0,1,2 and the 2 diagonals.
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Oct 15 2018
EXTENSIONS
a(27)-a(40) from Giovanni Resta, Oct 26 2018
STATUS
approved