Triangle read by rows: T(n,k)=number of ordered trees with n edges and k branch nodes at odd height.

A091958

Triangle read by rows: T(n,k)=number of ordered trees with n edges and k branch nodes at odd height.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =1a(5) =9a(6) =5a(7) =21a(8) =21a(9) =51a(10) =78a(11) =3a(12) =127a(13) =274a(14) =28a(15) =323a(16) =927a(17) =180a(18) =835a(19) =3061a(20) =954a(21) =12a(22) =2188a(23) =9933a(24) =4510a(25) =165a(26) =5798a(27) =31824a(28) =19734a(29) =1430

External references