Number of non-congruent solutions of x^2 + y^2 + z^2 + t^2 == 0 mod n.

Terms

a(0) =1a(1) =8a(2) =33a(3) =32a(4) =145a(5) =264a(6) =385a(7) =128a(8) =945a(9) =1160a(10) =1441a(11) =1056a(12) =2353a(13) =3080a(14) =4785a(15) =512a(16) =5185a(17) =7560a(18) =7201a(19) =4640a(20) =12705a(21) =11528a(22) =12673a(23) =4224a(24) =18625a(25) =18824a(26) =26001a(27) =12320a(28) =25201a(29) =38280