Norm of the sum of divisors function sigma(n) generalized for Gaussian integers.

Terms

a(0) =1a(1) =13a(2) =16a(3) =41a(4) =80a(5) =208a(6) =64a(7) =113a(8) =169a(9) =1040a(10) =144a(11) =656a(12) =360a(13) =832a(14) =1280a(15) =481a(16) =520a(17) =2197a(18) =400a(19) =3280a(20) =1024a(21) =1872a(22) =576a(23) =1808a(24) =2257a(25) =4680a(26) =1600a(27) =2624a(28) =1360a(29) =16640