Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4].
A220828
Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4].
Terms
- a(0) =4a(1) =10a(2) =20a(3) =55a(4) =220a(5) =1040a(6) =5480a(7) =31420a(8) =190360a(9) =1202930a(10) =7848720a(11) =52543935a(12) =359182620a(13) =2498614620a(14) =17640615900a(15) =126142316865a(16) =912047139460
External references
- oeis: A220828