Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 1)}.
A151423
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =28a(3) =355a(4) =5264a(5) =85764a(6) =1488432a(7) =27030861a(8) =507976040a(9) =9804514720a(10) =193339562208
External references
- oeis: A151423