Number of steps in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1),H=(2,0) and never going below the x-axis) from (0,0) to (2n,0).

A089164

Number of steps in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1),H=(2,0) and never going below the x-axis) from (0,0) to (2n,0).

Terms

    a(0) =3a(1) =19a(2) =107a(3) =591a(4) =3259a(5) =18019a(6) =99987a(7) =556831a(8) =3111347a(9) =17436915a(10) =97981179a(11) =551871087a(12) =3114878571a(13) =17613879747a(14) =99768824355a(15) =565962587199

External references