Number of different antisymmetric relations on n unlabeled points.

A083670

Number of different antisymmetric relations on n unlabeled points.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =44a(4) =558a(5) =16926a(6) =1319358a(7) =269695440a(8) =146202099255

External references