Real part of (1 + 2*i)^n, where i is sqrt(-1).

Terms

a(0) =1a(1) =1a(2) =-3a(3) =-11a(4) =-7a(5) =41a(6) =117a(7) =29a(8) =-527a(9) =-1199a(10) =237a(11) =6469a(12) =11753a(13) =-8839a(14) =-76443a(15) =-108691a(16) =164833a(17) =873121a(18) =922077a(19) =-2521451a(20) =-9653287a(21) =-6699319a(22) =34867797a(23) =103232189a(24) =32125393a(25) =-451910159a(26) =-1064447283a(27) =130656229a(28) =5583548873