Modulo 3 Pisano period of 'n-bonacci' series.

Terms

a(0) =1a(1) =8a(2) =13a(3) =26a(4) =104a(5) =728a(6) =364a(7) =80a(8) =91a(9) =8744a(10) =3851a(11) =3280a(12) =59048a(13) =4782968a(14) =7174453a(15) =3438578a(16) =16139240a(17) =5373368a(18) =5235412a(19) =1678822106a(20) =86049704a(21) =387420488a(22) =47071589413a(23) =140633637386a(24) =2952400a(25) =728a(26) =757a(27) =9526168288