Noncrossing, nonnesting, 2-arc-colored permutations on the set {1..n} where lower arcs even of different colors do not cross.
A219587
Noncrossing, nonnesting, 2-arc-colored permutations on the set {1..n} where lower arcs even of different colors do not cross.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =40a(4) =224a(5) =1296a(6) =7568a(7) =44304a(8) =259536a(9) =1520656a(10) =8910160a(11) =52209040a(12) =305919696a(13) =1792542992a(14) =10503446608a(15) =61545189520a(16) =360625475024
External references
- oeis: A219587