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A049615
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Array T by antidiagonals; T(i,j) = number of lattice points (x,y) hidden from (i,j), where 0<=x<=i, 0<=y<=j; (x,y) is hidden if there is a lattice point (h,k) collinear with and between (x,y) and (i,j).
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12
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0, 0, 0, 1, 0, 1, 2, 1, 1, 2, 3, 2, 3, 2, 3, 4, 3, 4, 4, 3, 4, 5, 4, 6, 6, 6, 4, 5, 6, 5, 7, 8, 8, 7, 5, 6, 7, 6, 9, 9, 11, 9, 9, 6, 7, 8, 7, 10, 12, 12, 12, 12, 10, 7, 8, 9, 8, 12, 13, 16, 14, 16, 13, 12, 8, 9, 10, 9, 13, 15, 17, 18, 18, 17, 15, 13, 9, 10
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