Number of walks f length n on a square lattice ending with x > 0 and y > 0.

A186648

Number of walks f length n on a square lattice ending with x > 0 and y > 0.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =6a(4) =38a(5) =130a(6) =662a(7) =2380a(8) =11174a(9) =41226a(10) =185642a(11) =695860a(12) =3055670a(13) =11576916a(14) =49995220a(15) =190876696a(16) =814610854a(17) =3128164186a(18) =13233277634a(19) =51046844836a(20) =214488337418a(21) =830382690556

External references