Number of connected graphs on n vertices whose spectrum has fewer than n distinct eigenvalues.
A242953
Number of connected graphs on n vertices whose spectrum has fewer than n distinct eigenvalues.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =10a(5) =58a(6) =314a(7) =3798a(8) =51609a(9) =1716267
External references
- oeis: A242953