Number of 1:3:sqrt(10) proportioned triangles on a (n+1) X (n+1) grid.

Terms

a(0) =0a(1) =0a(2) =24a(3) =80a(4) =168a(5) =344a(6) =624a(7) =1008a(8) =1584a(9) =2368a(10) =3360a(11) =4704a(12) =6384a(13) =8408a(14) =10984a(15) =14064a(16) =17664a(17) =22056a(18) =27152a(19) =32976a(20) =39888a(21) =47736a(22) =56544a(23) =66776a(24) =78216a(25) =90888a(26) =105360a(27) =121344a(28) =138864a(29) =158616