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, 1), (-1, 0), (0, 1), (1, -1), (1, 0), (1, 1)}.
A151329
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, 1), (-1, 0), (0, 1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =16a(3) =86a(4) =509a(5) =3065a(6) =19088a(7) =120401a(8) =771758a(9) =4991255a(10) =32580974a(11) =214030883a(12) =1414515215a(13) =9392000723a(14) =62625868280a(15) =419056150250
External references
- oeis: A151329