Number of unlabeled nonseparable (or 2-connected) multigraphs with n edges, loops allowed.
A360881
Number of unlabeled nonseparable (or 2-connected) multigraphs with n edges, loops allowed.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =9a(4) =19a(5) =44a(6) =111a(7) =328a(8) =1090a(9) =3988a(10) =15838a(11) =67295a(12) =301417a(13) =1412821a(14) =6882398a(15) =34682721a(16) =180170661a(17) =962288228a(18) =5273162329
External references
- oeis: A360881