Positive numbers of the form x^2 + xy - y^2; or, of the form 5x^2 - y^2.

Terms

a(0) =1a(1) =4a(2) =5a(3) =9a(4) =11a(5) =16a(6) =19a(7) =20a(8) =25a(9) =29a(10) =31a(11) =36a(12) =41a(13) =44a(14) =45a(15) =49a(16) =55a(17) =59a(18) =61a(19) =64a(20) =71a(21) =76a(22) =79a(23) =80a(24) =81a(25) =89a(26) =95a(27) =99a(28) =100a(29) =101