a(n) = ((3+sqrt(5))*(5+sqrt(5))^n + (3-sqrt(5))*(5-sqrt(5))^n)/2.
A163065
a(n) = ((3+sqrt(5))*(5+sqrt(5))^n + (3-sqrt(5))*(5-sqrt(5))^n)/2.
Terms
- a(0) =3a(1) =20a(2) =140a(3) =1000a(4) =7200a(5) =52000a(6) =376000a(7) =2720000a(8) =19680000a(9) =142400000a(10) =1030400000a(11) =7456000000a(12) =53952000000a(13) =390400000000
External references
- oeis: A163065