Maximal balanced binary trees in the Tamari lattices.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =4a(8) =6a(9) =9a(10) =11a(11) =13a(12) =22a(13) =38a(14) =60a(15) =89a(16) =128a(17) =183a(18) =256a(19) =353a(20) =512a(21) =805a(22) =1336a(23) =2221a(24) =3594a(25) =5665a(26) =8774a(27) =13433a(28) =20359a(29) =30550