Number of partially ordered sets ("posets") covering n unlabeled elements.

A381121

Number of partially ordered sets ("posets") covering n unlabeled elements.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =3a(4) =11a(5) =47a(6) =255a(7) =1727a(8) =14954a(9) =166232a(10) =2384053a(11) =44182143a(12) =1058142319a(13) =32718935706

External references