Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4], with each label used at least once.
A220831
Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4], with each label used at least once.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =3a(4) =36a(5) =310a(6) =2376a(7) =17304a(8) =123508a(9) =874998a(10) =6197220a(11) =44035861a(12) =314538360a(13) =2260572810a(14) =16353884828a(15) =119102737971a(16) =873124996284
External references
- oeis: A220831