Number of internal nodes of even outdegree in all ordered rooted trees with n edges.
A014301
Number of internal nodes of even outdegree in all ordered rooted trees with n edges.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =11a(4) =40a(5) =148a(6) =553a(7) =2083a(8) =7896a(9) =30086a(10) =115126a(11) =442118a(12) =1703052a(13) =6577474a(14) =25461493a(15) =98759971a(16) =383751472a(17) =1493506534a(18) =5820778858a(19) =22714926826a(20) =88745372992a(21) =347087585824
External references
- oeis: A014301