Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)}.
A151326
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =15a(3) =74a(4) =392a(5) =2116a(6) =11652a(7) =64967a(8) =365759a(9) =2074574a(10) =11836868a(11) =67863126a(12) =390625864a(13) =2256008404a(14) =13066434500a(15) =75864388248a(16) =441412162944
External references
- oeis: A151326