Number of isomorphism classes of connected irreducible posets with n labeled points.

A003431

Number of isomorphism classes of connected irreducible posets with n labeled points.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =0a(4) =1a(5) =12a(6) =104a(7) =956a(8) =10037a(9) =126578a(10) =1971005a(11) =38569954a(12) =958347642a(13) =30400603560

External references