Number of simple connected graphs on n unlabeled nodes with no node a member of more than one cycle.

A381468

Number of simple connected graphs on n unlabeled nodes with no node a member of more than one cycle.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =20a(7) =48a(8) =133a(9) =374a(10) =1124a(11) =3439a(12) =10923a(13) =35245a(14) =116128a(15) =387729a(16) =1312038a(17) =4485906a(18) =15486546a(19) =53900520a(20) =188998450a(21) =667062919a(22) =2368440477a(23) =8454560144a(24) =30328595227a(25) =109285433191a(26) =395425965732

External references