Numbers of the form x^2 + 4*y^2.

Terms

a(0) =0a(1) =1a(2) =4a(3) =5a(4) =8a(5) =9a(6) =13a(7) =16a(8) =17a(9) =20a(10) =25a(11) =29a(12) =32a(13) =36a(14) =37a(15) =40a(16) =41a(17) =45a(18) =49a(19) =52a(20) =53a(21) =61a(22) =64a(23) =65a(24) =68a(25) =72a(26) =73a(27) =80a(28) =81a(29) =85