a(n) = number of acyclic orientations of the complete tripartite graph K_{2,2,n}.
A370960
a(n) = number of acyclic orientations of the complete tripartite graph K_{2,2,n}.
Terms
- a(0) =14a(1) =78a(2) =426a(3) =2286a(4) =12090a(5) =63198a(6) =327306a(7) =1682766a(8) =8601690a(9) =43768638a(10) =221910186a(11) =1121897646a(12) =5659111290a(13) =28494757278a(14) =143272715466a(15) =719565670926
External references
- oeis: A370960