G.f.: (1 - 7*x - sqrt(49*x^2 - 18*x + 1))/(2*x).
A082366
G.f.: (1 - 7*x - sqrt(49*x^2 - 18*x + 1))/(2*x).
Terms
- a(0) =1a(1) =8a(2) =72a(3) =712a(4) =7560a(5) =84616a(6) =985032a(7) =11814728a(8) =145043208a(9) =1813915912a(10) =23029334856a(11) =296050614216
External references
- oeis: A082366