Number of positive integers <= 2^n of form 3 x^2 + 8 y^2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =7a(6) =12a(7) =23a(8) =41a(9) =73a(10) =136a(11) =253a(12) =471a(13) =888a(14) =1684a(15) =3211a(16) =6155a(17) =11831a(18) =22820a(19) =44137a(20) =85539a(21) =166105a(22) =323119a(23) =629511a(24) =1228111a(25) =2398846a(26) =4690672a(27) =9181509a(28) =17988393a(29) =35272010