Number of unlabeled connected loopless multigraphs with n nodes of degree 4 or less and with at most double edges.
A289158
Number of unlabeled connected loopless multigraphs with n nodes of degree 4 or less and with at most double edges.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =28a(5) =112a(6) =590a(7) =3419a(8) =23453a(9) =178599a(10) =1516692a(11) =14083855a(12) =142029043a(13) =1542152723a(14) =17925912574a(15) =221938298129
External references
- oeis: A289158