Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (1, -1), (1, 0), (1, 1)}.
A151433
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =23a(3) =242a(4) =2987a(5) =40663a(6) =591642a(7) =9033815a(8) =143086147a(9) =2332577417a(10) =38920508426a(11) =661997451570
External references
- oeis: A151433