Number of colored labeled n-node graphs with 2 interchangeable colors.

A000684

Number of colored labeled n-node graphs with 2 interchangeable colors.

Terms

    a(0) =1a(1) =3a(2) =13a(3) =81a(4) =721a(5) =9153a(6) =165313a(7) =4244481a(8) =154732801a(9) =8005686273a(10) =587435092993

External references