O.g.f. A(x) satisfies: A(x) = x * (1 - 4*x*A'(x)) / (1 - 5*x*A'(x)).
A300991
O.g.f. A(x) satisfies: A(x) = x * (1 - 4*x*A'(x)) / (1 - 5*x*A'(x)).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =66a(4) =769a(5) =10405a(6) =157540a(7) =2609120a(8) =46569365a(9) =886686635a(10) =17878075475a(11) =379658470550
External references
- oeis: A300991