Non-crossing, non-nesting, 3-colored permutations on {1,2,...,n}.

A224992

Non-crossing, non-nesting, 3-colored permutations on {1,2,...,n}.

Terms

    a(0) =1a(1) =3a(2) =18a(3) =144a(4) =1368a(5) =14400a(6) =160992a(7) =1861632a(8) =21919104a(9) =260508672a(10) =3110985216a(11) =37241118720a(12) =446349219840

External references