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

A339065

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

Terms

    a(0) =1a(1) =4a(2) =17a(3) =69a(4) =281a(5) =1147a(6) =4784a(7) =20345a(8) =88726a(9) =396971a(10) =1823920a(11) =8605364a(12) =41684417a(13) =207201343a(14) =1056244832a(15) =5518054182a(16) =29521703655a(17) =161625956908a(18) =904857279576

External references