Number of nonisomorphic unrooted unicursal planar maps with n edges and two vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).
A069725
Number of nonisomorphic unrooted unicursal planar maps with n edges and two vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =62a(5) =342a(6) =2152a(7) =13768a(8) =91800a(9) =622616a(10) =4301792a(11) =30100448a(12) =213019072a(13) =1521473984a(14) =10954616064a(15) =79420280064a(16) =579300888960
External references
- oeis: A069725