Triangle read by rows: T(n,k) is number of hex trees with n edges and k nonroot nodes of outdegree 2.

A126183

Triangle read by rows: T(n,k) is number of hex trees with n edges and k nonroot nodes of outdegree 2.

Terms

    a(0) =1a(1) =3a(2) =10a(3) =33a(4) =3a(5) =108a(6) =29a(7) =351a(8) =186a(9) =6a(10) =1134a(11) =990a(12) =95a(13) =3645a(14) =4725a(15) =900a(16) =15a(17) =11664a(18) =20979a(19) =6615a(20) =329a(21) =37179a(22) =88452a(23) =41580a(24) =4116a(25) =42a(26) =118098a(27) =358668a(28) =234738a(29) =38556

External references