Number of recursively anti-transitive rooted identity trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =5a(7) =9a(8) =17a(9) =33a(10) =63a(11) =126a(12) =254a(13) =511a(14) =1039a(15) =2124a(16) =4371a(17) =9059a(18) =18839a(19) =39339a(20) =82385a(21) =173111a(22) =364829a(23) =771010a(24) =1633313