Number of distinct quadratic residues mod 8^n.

Terms

a(0) =1a(1) =3a(2) =12a(3) =87a(4) =684a(5) =5463a(6) =43692a(7) =349527a(8) =2796204a(9) =22369623a(10) =178956972a(11) =1431655767a(12) =11453246124a(13) =91625968983a(14) =733007751852