Number of ordered unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 4.

A244533

Number of ordered unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 4.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =9a(6) =10a(7) =11a(8) =34a(9) =91a(10) =196a(11) =330a(12) =636a(13) =1377a(14) =2976a(15) =6061a(16) =12199a(17) =25186a(18) =52767a(19) =109066a(20) =224964a(21) =467605a(22) =979056a(23) =2042847a(24) =4244986a(25) =8844130a(26) =18527956a(27) =38878929a(28) =81460220a(29) =170576593

External references