Number of collinear point 9-tuples in an n X n cubical grid.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =20a(9) =224a(10) =1364a(11) =5984a(12) =21164a(13) =64064a(14) =172172a(15) =420992a(16) =952988a(17) =2022672a(18) =4065084a(19) =7794240a(20) =14346780a(21) =25473360a(22) =43815420a(23) =73244160a(24) =119362160a(25) =190057520a(26) =296373008