Number of series-reduced plane trees with n leaves such that each branch directly under any given node has a different number of leaves.
A319123
Number of series-reduced plane trees with n leaves such that each branch directly under any given node has a different number of leaves.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =75a(6) =277a(7) =1083a(8) =4419a(9) =18493a(10) =77729a(11) =332557a(12) =1444477a(13) =6307225a(14) =27912147a(15) =123878207a(16) =554733045a(17) =2492087531a(18) =11280537097a(19) =51120499279a(20) =233319480419
External references
- oeis: A319123