Number of different quasi-orders (or topologies, or transitive digraphs) with n labeled elements.

A000798

Number of different quasi-orders (or topologies, or transitive digraphs) with n labeled elements.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =29a(4) =355a(5) =6942a(6) =209527a(7) =9535241a(8) =642779354a(9) =63260289423

External references