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, 0), (-1, 1), (1, 0), (1, 1)}.
A151403
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, 0), (-1, 1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =4a(2) =32a(3) =320a(4) =3584a(5) =43008a(6) =540672a(7) =7028736a(8) =93716480a(9) =1274544128a(10) =17611882496a(11) =246566354944
External references
- oeis: A151403