a(n) = (2*sqrt(7)*sin(Pi/7))^n + (-2*sqrt(7)*sin(2*Pi/7))^n + (-2*sqrt(7)*sin(4*Pi/7))^n.
A275830
a(n) = (2*sqrt(7)*sin(Pi/7))^n + (-2*sqrt(7)*sin(2*Pi/7))^n + (-2*sqrt(7)*sin(4*Pi/7))^n.
Terms
- a(0) =3a(1) =-7a(2) =49a(3) =-196a(4) =1029a(5) =-4802a(6) =24010a(7) =-117649a(8) =588245a(9) =-2941225a(10) =14823774a(11) =-74942413a(12) =380476866a(13) =-1936973136a(14) =9886633715a(15) =-50563069571a(16) =259029803333
External references
- oeis: A275830