Number of unsensed combinatorial maps with n edges and 2 vertices.

A380620

Number of unsensed combinatorial maps with n edges and 2 vertices.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =33a(4) =198a(5) =1571a(6) =16431a(7) =213831a(8) =3288821

External references