Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (0, -1), (0, 1), (1, -1), (1, 1)}.
A151311
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (0, -1), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =39a(4) =198a(5) =925a(6) =4776a(7) =24060a(8) =126487a(9) =661878a(10) =3535036a(11) =18912243a(12) =102315291a(13) =555380560a(14) =3035526926a(15) =16648736296a(16) =91744178637a(17) =507145996099
External references
- oeis: A151311