Number of connected partially ordered sets with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.

A022017

Number of connected partially ordered sets with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.

Terms

    a(0) =1a(1) =3a(2) =8a(3) =29a(4) =103a(5) =442a(6) =1953a(7) =9502a(8) =48533a(9) =262634a(10) =1485764a(11) =8777397a(12) =53869119

External references