Number of labeled graded partially ordered sets with n elements of height at most 1.
A001831
Number of labeled graded partially ordered sets with n elements of height at most 1.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =87a(5) =841a(6) =11643a(7) =227893a(8) =6285807a(9) =243593041a(10) =13262556723
External references
- oeis: A001831