Number of non-collinear triples in a 5 X n rectangular grid.

Terms

a(0) =0a(1) =100a(2) =412a(3) =1056a(4) =2148a(5) =3820a(6) =6176a(7) =9352a(8) =13456a(9) =18612a(10) =24940a(11) =32568a(12) =41596a(13) =52164a(14) =64384a(15) =78376a(16) =94256a(17) =112156a(18) =132180a(19) =154464a(20) =179116a(21) =206260a(22) =236016a(23) =268512a(24) =303848a(25) =342164a(26) =383572a(27) =428192a(28) =476140a(29) =527548