Number of unlabeled acyclic digraphs with n arcs and a global source and sink.

A350492

Number of unlabeled acyclic digraphs with n arcs and a global source and sink.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =14a(6) =44a(7) =153a(8) =584a(9) =2414a(10) =10732a(11) =50909a(12) =256198a(13) =1360645a(14) =7593530a(15) =44366458a(16) =270517289a(17) =1716555943a(18) =11308051214a(19) =77170484915a(20) =544525867544

External references