Numerator of imaginary part of (3*i - 1)^(-n).

Terms

a(0) =0a(1) =-3a(2) =3a(3) =9a(4) =-6a(5) =3a(6) =117a(7) =-249a(8) =-21a(9) =1917a(10) =-237a(11) =-9111a(12) =1287a(13) =24963a(14) =-76443a(15) =28071a(16) =11067a(17) =-848643a(18) =-922077a(19) =6087369a(20) =-184623a(21) =-27482877a(22) =34867797a(23) =67678791a(24) =-15126111a(25) =145641597a(26) =1064447283a(27) =-2857102551a(28) =-308141733a(29) =19215780483