Denominator of real part of (3*i - 1)^(-n).

Terms

a(0) =1a(1) =10a(2) =25a(3) =500a(4) =2500a(5) =25000a(6) =31250a(7) =1250000a(8) =6250000a(9) =62500000a(10) =78125000a(11) =3125000000a(12) =15625000000a(13) =156250000000a(14) =195312500000