Number of distinct quadratic residues mod 7^n.

Terms

a(0) =1a(1) =4a(2) =22a(3) =151a(4) =1051a(5) =7354a(6) =51472a(7) =360301a(8) =2522101a(9) =17654704a(10) =123582922a(11) =865080451a(12) =6055563151a(13) =42388942054a(14) =296722594372