Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 0)}.
A151344
Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =35a(4) =313a(5) =3253a(6) =37540a(7) =467990a(8) =6190709a(9) =85835624a(10) =1236484572a(11) =18384929389a(12) =280749914660
External references
- oeis: A151344