The number of complete binary trees with bicolored twigs. A twig is a vertex with one child on the boundary and the other child having no descendants.
A228404
The number of complete binary trees with bicolored twigs. A twig is a vertex with one child on the boundary and the other child having no descendants.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =24a(4) =76a(5) =249a(6) =836a(7) =2860a(8) =9932a(9) =34918a(10) =124032a(11) =444448a(12) =1604664a(13) =5831765a(14) =21316860a(15) =78319140a(16) =289064460a(17) =1071275370a(18) =3984871440a(19) =14872552560a(20) =55678270440a(21) =209027020410a(22) =786750047304
External references
- oeis: A228404