A099707 - OEIS

%I #9 Jun 25 2017 15:18:03

%S 1,2,40,1632,140128,42396096,71916221184,569069398642688,

%T 18501543711357418496,2419851465592233142433792

%N Consider the family of multigraphs enriched by the species of directed graphs. Sequence gives number of those multigraphs with n arcs.

%D G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004.

%H G. Paquin, <a href="/A038205/a038205.pdf">Dénombrement de multigraphes enrichis</a>, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004. [Cached copy, with permission]

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Oct 26 2004