Strongly graded (3+1)-free partially ordered sets (posets) on n labeled vertices.
A222863
Strongly graded (3+1)-free partially ordered sets (posets) on n labeled vertices.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =111a(5) =1381a(6) =22383a(7) =461413a(8) =12163791a(9) =420626821a(10) =19880808303
External references
- oeis: A222863