Real part of (n + i)^4.

Terms

a(0) =1a(1) =-4a(2) =-7a(3) =28a(4) =161a(5) =476a(6) =1081a(7) =2108a(8) =3713a(9) =6076a(10) =9401a(11) =13916a(12) =19873a(13) =27548a(14) =37241a(15) =49276a(16) =64001a(17) =81788a(18) =103033a(19) =128156a(20) =157601a(21) =191836a(22) =231353a(23) =276668a(24) =328321a(25) =386876a(26) =452921a(27) =527068a(28) =609953a(29) =702236