Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (1, -1), (1, 0), (1, 1)}.
A151303
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =30a(4) =122a(5) =508a(6) =2163a(7) =9336a(8) =40804a(9) =179887a(10) =799120a(11) =3571698a(12) =16048114a(13) =72428799a(14) =328167457a(15) =1491978164a(16) =6803716892a(17) =31110321096a(18) =142600055057a(19) =655074921487
External references
- oeis: A151303