Maximal number of squares of side 1 in an ellipse of semiaxes n,2n.

Terms

a(0) =3a(1) =17a(2) =43a(3) =83a(4) =137a(5) =203a(6) =279a(7) =369a(8) =471a(9) =587a(10) =715a(11) =857a(12) =1011a(13) =1175a(14) =1351a(15) =1541a(16) =1743a(17) =1961a(18) =2191a(19) =2429a(20) =2683a(21) =2949a(22) =3227a(23) =3523a(24) =3829a(25) =4137a(26) =4469a(27) =4809a(28) =5167a(29) =5539