Number of unrooted Eulerian n-edge maps in the plane (planar with a distinguished outside face).
A103939
Number of unrooted Eulerian n-edge maps in the plane (planar with a distinguished outside face).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =136a(6) =722a(7) =3924a(8) =22954a(9) =138316a(10) =860364a(11) =5472444a(12) =35503288a(13) =234070648a(14) =1564945158a(15) =10589356592a(16) =72412611194a(17) =499788291616
External references
- oeis: A103939