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, -1), (1, 0), (1, 1)}.
A151471
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, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =5a(2) =70a(3) =1335a(4) =29722a(5) =726726a(6) =18924180a(7) =515622393a(8) =14537063970a(9) =420926828322
External references
- oeis: A151471