Number of unrooted directed trees on n nodes with a red root.

A097630

Number of unrooted directed trees on n nodes with a red root.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =70a(4) =1093a(5) =22426a(6) =578779a(7) =17976302a(8) =653866441a(9) =27270138898

External references