Number of walks of length n on square lattice, starting at origin, staying on points with x+y >= 0.

A060899

Number of walks of length n on square lattice, starting at origin, staying on points with x+y >= 0.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =24a(4) =96a(5) =320a(6) =1280a(7) =4480a(8) =17920a(9) =64512a(10) =258048a(11) =946176a(12) =3784704a(13) =14057472a(14) =56229888a(15) =210862080a(16) =843448320a(17) =3186360320a(18) =12745441280a(19) =48432676864a(20) =193730707456a(21) =739699064832

External references