O.g.f. A(x) satisfies: A(x) = x*(1 - 2*x*A'(x)) / (1 - 3*x*A'(x)).
A300987
O.g.f. A(x) satisfies: A(x) = x*(1 - 2*x*A'(x)) / (1 - 3*x*A'(x)).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =36a(4) =327a(5) =3489a(6) =42048a(7) =559008a(8) =8073243a(9) =125328411a(10) =2075525505a(11) =36460943208a(12) =676484058564
External references
- oeis: A300987