Recursive binary interleaving code for rooted plane binary trees, as ordered by A014486.

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =11a(5) =35a(6) =7a(7) =21a(8) =69a(9) =139a(10) =2059a(11) =43a(12) =547a(13) =8227a(14) =15a(15) =39a(16) =23a(17) =277a(18) =4117a(19) =71a(20) =85a(21) =1093a(22) =16453a(23) =32907a(24) =8388747a(25) =2187a(26) =526347a(27) =134219787a(28) =171a(29) =2091