Number of planar rooted Eulerian orientations (i.e., planar directed Eulerian maps with in-degree and out-degree equal for each vertex) with n edges.
A277493
Number of planar rooted Eulerian orientations (i.e., planar directed Eulerian maps with in-degree and out-degree equal for each vertex) with n edges.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =66a(4) =504a(5) =4216a(6) =37548a(7) =350090a(8) =3380520a(9) =33558024a(10) =340670720a(11) =3522993656a(12) =37003723200a(13) =393856445664
External references
- oeis: A277493