Number of homeomorphically irreducible multigraphs (or series-reduced multigraphs or multigraphs without nodes of degree 2) on 5 labeled nodes.

A060535

Number of homeomorphically irreducible multigraphs (or series-reduced multigraphs or multigraphs without nodes of degree 2) on 5 labeled nodes.

Terms

    a(0) =1a(1) =10a(2) =15a(3) =30a(4) =165a(5) =430a(6) =1170a(7) =3180a(8) =7935a(9) =18610a(10) =40948a(11) =84570a(12) =164740a(13) =304690a(14) =538630a(15) =915574a(16) =1504135a(17) =2398460a(18) =3725495a(19) =5653790a(20) =8404075a(21) =12261860a(22) =17592335a(23) =24857870a(24) =34638440a(25) =47655326a(26) =64798470a(27) =87157890a(28) =116059590

External references