Number of unlabeled graphs on n vertices without 4-cycles or 5-cycles.
A366220
Number of unlabeled graphs on n vertices without 4-cycles or 5-cycles.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =17a(5) =41a(6) =100a(7) =267a(8) =772a(9) =2442a(10) =8512a(11) =33076a(12) =143430a(13) =697037a(14) =3791763a(15) =23043296a(16) =155896190a(17) =1169641637a(18) =9693805936
External references
- oeis: A366220