Imaginary Rabbits: imaginary part of a(0)=i; a(1)=-i; a(n) = a(n-1) + i*a(n-2), with i = sqrt(-1).

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =-1a(4) =-2a(5) =-2a(6) =-1a(7) =1a(8) =5a(9) =11a(10) =18a(11) =24a(12) =25a(13) =15a(14) =-13a(15) =-65a(16) =-142a(17) =-234a(18) =-313a(19) =-327a(20) =-199a(21) =163a(22) =838a(23) =1840a(24) =3041a(25) =4079a(26) =4279a(27) =2639a(28) =-2042a(29) =-10802