Numbers of the form (x^2+xy+2y^2 with x>=0, y>=0).

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =8a(5) =9a(6) =11a(7) =14a(8) =16a(9) =18a(10) =22a(11) =23a(12) =25a(13) =28a(14) =32a(15) =36a(16) =37a(17) =43a(18) =44a(19) =46a(20) =49a(21) =50a(22) =53a(23) =56a(24) =58a(25) =64a(26) =71a(27) =72a(28) =74a(29) =77