From a problem concerning circulant matrices and Gauss sums.

Terms

a(0) =1a(1) =1a(2) =0a(3) =4a(4) =1a(5) =0a(6) =13a(7) =4a(8) =27a(9) =1a(10) =1a(11) =0a(12) =25a(13) =13a(14) =0a(15) =16a(16) =1a(17) =27a(18) =37a(19) =4a(20) =0a(21) =1a(22) =1a(23) =0a(24) =25a(25) =25a(26) =81a(27) =52a(28) =1a(29) =0