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, 0), (1, 1)}.
A151330
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, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =17a(3) =95a(4) =577a(5) =3591a(6) =22913a(7) =148423a(8) =973297a(9) =6440919a(10) =42938417a(11) =287943719a(12) =1940382241a(13) =13129012247a(14) =89139404337a(15) =606990586023
External references
- oeis: A151330