Number of nonisomorphic unrooted Eulerian planar maps with n edges (Eulerian means that all vertices are of even valency; there is an Eulerian cycle).
A069727
Number of nonisomorphic unrooted Eulerian planar maps with n edges (Eulerian means that all vertices are of even valency; there is an Eulerian cycle).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =34a(6) =154a(7) =675a(8) =3534a(9) =18985a(10) =108070a(11) =632109a(12) =3807254a(13) =23411290a(14) =146734695a(15) =934382820a(16) =6034524474a(17) =39457153432a(18) =260855420489
External references
- oeis: A069727