Number of irreducible exceptional curves of first kind on del Pezzo surface of degree 9-n.
A033541
Number of irreducible exceptional curves of first kind on del Pezzo surface of degree 9-n.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =16a(6) =27a(7) =56a(8) =240
External references
- oeis: A033541