Number of nonisomorphic 2-graphs with n nodes with first and second cohomology invariants both 0.
A006627
Number of nonisomorphic 2-graphs with n nodes with first and second cohomology invariants both 0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =14a(6) =54a(7) =224a(8) =2038a(9) =32728
External references
- oeis: A006627