a(n) = 20*a(n-1) - 3*a(n-2).
A136270
a(n) = 20*a(n-1) - 3*a(n-2).
Terms
- a(0) =1a(1) =17a(2) =337a(3) =6689a(4) =132769a(5) =2635313a(6) =52307953a(7) =1038253121a(8) =20608138561a(9) =409048011857
External references
- oeis: A136270
A136270
a(n) = 20*a(n-1) - 3*a(n-2).