Number of positive integers <= 2^n of form 5 x^2 + 5 y^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =4a(6) =7a(7) =13a(8) =24a(9) =44a(10) =80a(11) =149a(12) =276a(13) =517a(14) =975a(15) =1852a(16) =3537a(17) =6775a(18) =13027a(19) =25128a(20) =48589a(21) =94151a(22) =182809a(23) =355553a(24) =692591a(25) =1350973a(26) =2638450a(27) =5158567a(28) =10096032a(29) =19777579