G.f.: (1 - 6*x - sqrt(36*x^2 - 16*x + 1))/(2*x).
A082305
G.f.: (1 - 6*x - sqrt(36*x^2 - 16*x + 1))/(2*x).
Terms
- a(0) =1a(1) =7a(2) =56a(3) =497a(4) =4760a(5) =48174a(6) =507696a(7) =5516133a(8) =61363736a(9) =695540258a(10) =8004487568a(11) =93283238986
External references
- oeis: A082305