Number of naturally embedded binary trees with n nodes that have no label greater than 0.

A101488

Number of naturally embedded binary trees with n nodes that have no label greater than 0.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =10a(6) =26a(7) =73a(8) =213a(9) =645a(10) =2007a(11) =6391a(12) =20741a(13) =68407a(14) =228753a(15) =774162a(16) =2647548a(17) =9138342a(18) =31802118a(19) =111489492a(20) =393442848a(21) =1396771812a(22) =4985732628a(23) =17884908282a(24) =64449398994a(25) =233220788850a(26) =847211744806

External references