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, 0), (1, 1)}.
A151361
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, 0), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =13a(3) =124a(4) =1427a(5) =18424a(6) =257090a(7) =3794091a(8) =58411957a(9) =929535968a(10) =15190791558a(11) =253735278108
External references
- oeis: A151361