Number of unrooted labeled trees on 2n nodes with node degree either one or three.

A274056

Number of unrooted labeled trees on 2n nodes with node degree either one or three.

Terms

    a(0) =1a(1) =4a(2) =90a(3) =5040a(4) =529200a(5) =89812800a(6) =22475653200

External references