O.g.f. A(x) satisfies: A(x) = x*(1 - 3*x*A'(x)) / (1 - 4*x*A'(x)).
A300989
O.g.f. A(x) satisfies: A(x) = x*(1 - 3*x*A'(x)) / (1 - 4*x*A'(x)).
Terms
- a(0) =1a(1) =1a(2) =6a(3) =50a(4) =520a(5) =6312a(6) =86080a(7) =1288704a(8) =20862720a(9) =361454720a(10) =6652338176a(11) =129341001216
External references
- oeis: A300989