Number of series-reduced anti-binary (no unary or binary branchings) unlabeled rooted trees with n nodes.

A303025

Number of series-reduced anti-binary (no unary or binary branchings) unlabeled rooted trees with n nodes.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =4a(9) =7a(10) =11a(11) =17a(12) =28a(13) =46a(14) =74a(15) =123a(16) =205a(17) =341a(18) =571a(19) =964a(20) =1629a(21) =2764a(22) =4707a(23) =8040a(24) =13766a(25) =23639a(26) =40681a(27) =70163a(28) =121256a(29) =209960

External references