Number of triangles in an n X n unit grid that have minimal possible area (of 1/2).

Terms

a(0) =0a(1) =4a(2) =32a(3) =124a(4) =320a(5) =716a(6) =1328a(7) =2340a(8) =3792a(9) =5852a(10) =8544a(11) =12260a(12) =16864a(13) =22916a(14) =30272a(15) =39188a(16) =49824a(17) =62948a(18) =78080a(19) =96348a(20) =117232a(21) =141260a(22) =168480a(23) =200292a(24) =235680a(25) =276100a(26) =321056a(27) =371484a(28) =427024a(29) =489900