Number of positive integers <= 2^n of form x^2 + 10 y^2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =7a(5) =10a(6) =20a(7) =36a(8) =65a(9) =118a(10) =221a(11) =409a(12) =776a(13) =1463a(14) =2788a(15) =5328a(16) =10222a(17) =19714a(18) =38054a(19) =73685a(20) =142944a(21) =277838a(22) =540889a(23) =1054535a(24) =2058537a(25) =4023278a(26) =7871313a(27) =15414638a(28) =30213190a(29) =59266422