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), (1, -1), (1, 0), (1, 1)}.
A151308
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), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =34a(4) =161a(5) =690a(6) =3340a(7) =15127a(8) =74025a(9) =345350a(10) =1700641a(11) =8078534a(12) =39940239a(13) =191998427a(14) =951780628a(15) =4613430423a(16) =22912945993a(17) =111732959607a(18) =555692292248
External references
- oeis: A151308