Number of nonisomorphic unrooted unicursal planar maps with n edges (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

A069724

Number of nonisomorphic unrooted unicursal planar maps with n edges (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

Terms

    a(0) =1a(1) =2a(2) =9a(3) =38a(4) =214a(5) =1253a(6) =7925a(7) =51620a(8) =346307a(9) =2365886a(10) =16421359a(11) =115384738a(12) =819276830a(13) =5868540399a(14) =42357643916a(15) =307753571520

External references