Number of plane trees of total weight n of combinatorial class T=Z*U + Z*T^2/(1-T) with nodes Z of weight one and leaves U of weight three.

A331106

Number of plane trees of total weight n of combinatorial class T=Z*U + Z*T^2/(1-T) with nodes Z of weight one and leaves U of weight three.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =0a(6) =0a(7) =0a(8) =1a(9) =0a(10) =0a(11) =0a(12) =1a(13) =2a(14) =0a(15) =0a(16) =1a(17) =5a(18) =5a(19) =0a(20) =1a(21) =9a(22) =21a(23) =14a(24) =1a(25) =14a(26) =56a(27) =84a(28) =43a(29) =20

External references