Number of plane bipolar posets (i.e., plane bipolar orientations with no transitive edge) with n edges.

A363682

Number of plane bipolar posets (i.e., plane bipolar orientations with no transitive edge) with n edges.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =12a(6) =32a(7) =93a(8) =279a(9) =872a(10) =2830a(11) =9433a(12) =32223a(13) =112527a(14) =400370a(15) =1448520a(16) =5320023a(17) =19802827a(18) =74612164a(19) =284238390a(20) =1093757436a(21) =4247742956a(22) =16636921148a(23) =65671960544a(24) =261111950308

External references