Number of positive integers <= 2^n of form 7 x^2 + 7 y^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =3a(6) =6a(7) =11a(8) =18a(9) =33a(10) =60a(11) =110a(12) =204a(13) =381a(14) =717a(15) =1355a(16) =2582a(17) =4939a(18) =9485a(19) =18264a(20) =35273a(21) =68275a(22) =132440a(23) =257385a(24) =500985a(25) =976621a(26) =1906221a(27) =3725007a(28) =7286865a(29) =14268275