Number of triangles on a 4 X n grid.

Terms

a(0) =0a(1) =48a(2) =200a(3) =516a(4) =1056a(5) =1884a(6) =3052a(7) =4628a(8) =6668a(9) =9232a(10) =12380a(11) =16176a(12) =20672a(13) =25936a(14) =32024a(15) =38996a(16) =46912a(17) =55836a(18) =65820a(19) =76932a(20) =89228a(21) =102768a(22) =117612a(23) =133824a(24) =151456a(25) =170576a(26) =191240a(27) =213508a(28) =237440a(29) =263100