Number of line segments connecting exactly 5 points in an n x n grid of points.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =12a(5) =32a(6) =60a(7) =96a(8) =160a(9) =240a(10) =336a(11) =448a(12) =632a(13) =848a(14) =1096a(15) =1376a(16) =1760a(17) =2192a(18) =2672a(19) =3200a(20) =3952a(21) =4784a(22) =5696a(23) =6688a(24) =7864a(25) =9136a(26) =10504a(27) =11968a(28) =13888a(29) =15952