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), (0, 1), (1, 0), (1, 1)}.
A151317
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), (0, 1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =51a(4) =227a(5) =1029a(6) =4758a(7) =22208a(8) =104646a(9) =496191a(10) =2365664a(11) =11326328a(12) =54426543a(13) =262319780a(14) =1267609850a(15) =6139159720a(16) =29791023708a(17) =144814066045a(18) =705022920195
External references
- oeis: A151317