OFFSET

0,5

COMMENTS

The infinity slope is not counted unless i=0 and j>0. - Max Alekseyev, Oct 23 2008

LINKS

Max A. Alekseyev. On the number of two-dimensional threshold functions, arXiv:math/0602511 [math.CO], 2006-2010; SIAM J. Disc. Math. 24(4), 2010, pp. 1617-1631. doi:10.1137/090750184.

FORMULA

For m,n > 0, T(m,n) = 1 + U(m,n) = 1 + Sum_{i=1..m, j=1..n, gcd(i,j)=1} 1. - Max Alekseyev, Oct 23 2008

EXAMPLE

Diagonals (each starting on row 1): {0}; {1,1}; {1,2,1}; ...

CROSSREFS

KEYWORD

AUTHOR

EXTENSIONS

More terms from Max Alekseyev, Oct 23 2008

STATUS

approved