Number of 1:4:sqrt(17) proportioned triangles on a (n+1) X (n+1) grid.

Terms

a(0) =0a(1) =0a(2) =0a(3) =32a(4) =96a(5) =192a(6) =320a(7) =560a(8) =912a(9) =1368a(10) =1920a(11) =2712a(12) =3728a(13) =4960a(14) =6400a(15) =8256a(16) =10480a(17) =13064a(18) =16000a(19) =19600a(20) =23736a(21) =28408a(22) =33608a(23) =39768a(24) =46680a(25) =54344a(26) =62744a(27) =72448a(28) =83152a(29) =94864