Number of lines through exactly 8 points of an n X n grid of points.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =18a(9) =4a(10) =4a(11) =4a(12) =4a(13) =4a(14) =4a(15) =36a(16) =76a(17) =52a(18) =20a(19) =20a(20) =20a(21) =20a(22) =112a(23) =220a(24) =344a(25) =276a(26) =192a(27) =92a(28) =92a(29) =212