Number of binary trees (each vertex has 0, or 1 left, or 1 right, or 2 children) with n edges and having all leaves at the same level.
A106376
Number of binary trees (each vertex has 0, or 1 left, or 1 right, or 2 children) with n edges and having all leaves at the same level.
Terms
- a(0) =2a(1) =5a(2) =10a(3) =24a(4) =52a(5) =121a(6) =258a(7) =616a(8) =1344a(9) =3128a(10) =6996a(11) =16160a(12) =36248a(13) =85041a(14) =191298a(15) =444168a(16) =1019328a(17) =2359392a(18) =5405488a(19) =12625336a(20) =29066304a(21) =67659824a(22) =156911364a(23) =365683744a(24) =849401072a(25) =1987046192a(26) =4624252776a(27) =10816019328
External references
- oeis: A106376