Number of labeled 4-trees with n nodes.
A036506
Number of labeled 4-trees with n nodes.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =15a(6) =455a(7) =20230a(8) =1166886a(9) =82031250a(10) =6768679170a(11) =639276644655
External references
- oeis: A036506