Number of 1:2:sqrt(5) proportioned triangles on an (n+1) X (n+1) grid.

Terms

a(0) =0a(1) =16a(2) =64a(3) =176a(4) =384a(5) =744a(6) =1288a(7) =2104a(8) =3224a(9) =4776a(10) =6784a(11) =9408a(12) =12672a(13) =16776a(14) =21736a(15) =27792a(16) =34944a(17) =43488a(18) =53400a(19) =65032a(20) =78336a(21) =93720a(22) =111112a(23) =130976a(24) =153216a(25) =178360a(26) =206272a(27) =237552a(28) =272024a(29) =310368