Number of 2:3:sqrt(13) proportioned triangles on a (n+1)X(n+1) grid.

Terms

a(0) =0a(1) =0a(2) =16a(3) =48a(4) =120a(5) =248a(6) =440a(7) =736a(8) =1152a(9) =1720a(10) =2464a(11) =3440a(12) =4672a(13) =6192a(14) =8080a(15) =10344a(16) =13040a(17) =16264a(18) =20024a(19) =24376a(20) =29456a(21) =35248a(22) =41832a(23) =49360a(24) =57808a(25) =67280a(26) =77936a(27) =89760a(28) =102840a(29) =117392