Number of labeled PQ-trees with n leaves.
A136629
Number of labeled PQ-trees with n leaves.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =7a(4) =68a(5) =941a(6) =16657a(7) =360151a(8) =9197036a(9) =270900242a(10) =9041240104a(11) =337195959574
External references
- oeis: A136629