Number of distinct quadratic residues mod 6^n.

Terms

a(0) =1a(1) =4a(2) =8a(3) =33a(4) =124a(5) =644a(6) =3288a(7) =18883a(8) =108284a(9) =642234a(10) =3808768a(11) =22785833a(12) =136315044a(13) =817291024a(14) =4900153448a(15) =29395534383a(16) =176340899404