Number of (unlabeled) connected loopless multigraphs such that the sum of the numbers of vertices and edges is n.

A265582

Number of (unlabeled) connected loopless multigraphs such that the sum of the numbers of vertices and edges is n.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =2a(6) =3a(7) =6a(8) =10a(9) =21a(10) =41a(11) =87a(12) =187a(13) =423a(14) =971a(15) =2324a(16) =5668a(17) =14224a(18) =36506a(19) =95880a(20) =257081a(21) =703616a(22) =1962887a(23) =5578529a(24) =16137942a(25) =47492141a(26) =142093854a(27) =432001458a(28) =1333937382a(29) =4181500703

External references