a(n) = ((3+sqrt(3))*(4+sqrt(3))^n+(3-sqrt(3))*(4-sqrt(3))^n)/6.
A162557
a(n) = ((3+sqrt(3))*(4+sqrt(3))^n+(3-sqrt(3))*(4-sqrt(3))^n)/6.
Terms
- a(0) =1a(1) =5a(2) =27a(3) =151a(4) =857a(5) =4893a(6) =28003a(7) =160415a(8) =919281a(9) =5268853a(10) =30200171a(11) =173106279a(12) =992248009a(13) =5687602445a(14) =32601595443a(15) =186873931759
External references
- oeis: A162557