Number of lines through at least 2 points of a 6 X n grid of points.

Terms

a(0) =0a(1) =1a(2) =38a(3) =75a(4) =136a(5) =207a(6) =306a(7) =405a(8) =534a(9) =673a(10) =836a(11) =1003a(12) =1200a(13) =1401a(14) =1632a(15) =1869a(16) =2128a(17) =2397a(18) =2696a(19) =2995a(20) =3324a(21) =3661a(22) =4022a(23) =4389a(24) =4786a(25) =5187a(26) =5616a(27) =6051a(28) =6510a(29) =6979