Number of ordered rooted trees with n non-root nodes and all outdegrees <= six.

A036768

Number of ordered rooted trees with n non-root nodes and all outdegrees <= six.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =132a(7) =428a(8) =1421a(9) =4807a(10) =16510a(11) =57421a(12) =201824a(13) =715768a(14) =2558167a(15) =9204651a(16) =33315919a(17) =121218195a(18) =443107245a(19) =1626546453a(20) =5993256280a(21) =22158739970a(22) =82182744284a(23) =305670888560

External references