Number of unlabeled connected loopless multigraphs with n edges rooted at two indistinguishable vertices.

A339043

Number of unlabeled connected loopless multigraphs with n edges rooted at two indistinguishable vertices.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =43a(4) =178a(5) =767a(6) =3425a(7) =15783a(8) =74775a(9) =363639a(10) =1811808a(11) =9239430a(12) =48175945a(13) =256658465a(14) =1396152633a(15) =7750325528a(16) =43882706171a(17) =253308596926

External references