Number of set-systems on n vertices that are closed under union and intersection.

A326900

Number of set-systems on n vertices that are closed under union and intersection.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =29a(4) =232a(5) =3032a(6) =62837a(7) =2009408a(8) =97034882a(9) =6952703663a(10) =728107141058

External references