Number of transitive finitary sets with n brackets. Number of transitive rooted identity trees with n nodes.

A279861

Number of transitive finitary sets with n brackets. Number of transitive rooted identity trees with n nodes.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =1a(4) =0a(5) =0a(6) =1a(7) =1a(8) =0a(9) =0a(10) =2a(11) =1a(12) =2a(13) =2a(14) =2a(15) =5a(16) =4a(17) =6a(18) =8a(19) =10a(20) =14a(21) =23a(22) =26a(23) =34a(24) =46a(25) =64a(26) =81a(27) =115a(28) =158a(29) =199

External references