Number of labeled graded partially ordered sets with n elements.
A001833
Number of labeled graded partially ordered sets with n elements.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =19a(4) =219a(5) =3991a(6) =106623a(7) =3964339a(8) =199515459a(9) =13399883551
External references
- oeis: A001833