Number of lines through exactly 9 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) =0a(9) =20a(10) =4a(11) =4a(12) =4a(13) =4a(14) =4a(15) =4a(16) =4a(17) =40a(18) =84a(19) =56a(20) =20a(21) =20a(22) =20a(23) =20a(24) =20a(25) =124a(26) =244a(27) =380a(28) =300a(29) =204