Gaussian norm of 1+(1+i)^n.

Terms

a(0) =4a(1) =5a(2) =5a(3) =5a(4) =9a(5) =25a(6) =65a(7) =145a(8) =289a(9) =545a(10) =1025a(11) =1985a(12) =3969a(13) =8065a(14) =16385a(15) =33025a(16) =66049a(17) =131585a(18) =262145a(19) =523265a(20) =1046529a(21) =2095105a(22) =4194305a(23) =8392705a(24) =16785409a(25) =33562625a(26) =67108865a(27) =134201345a(28) =268402689a(29) =536838145