Number of series-reduced rooted trees with n unlabeled leaves where the number of distinct branches under each node is <= 2.

A317098

Number of series-reduced rooted trees with n unlabeled leaves where the number of distinct branches under each node is <= 2.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =31a(6) =80a(7) =214a(8) =576a(9) =1595a(10) =4448a(11) =12625a(12) =36146a(13) =104662a(14) =305251a(15) =897417a(16) =2654072a(17) =7895394a(18) =23601441a(19) =70871693a(20) =213660535a(21) =646484951a(22) =1962507610a(23) =5975425743a(24) =18243789556a(25) =55841543003a(26) =171320324878a(27) =526738779846

External references