Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (0, 1), (1, 0)}.
A151363
Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (0, 1), (1, 0)}.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =1a(4) =10a(5) =14a(6) =75a(7) =178a(8) =738a(9) =2304a(10) =8753a(11) =31186a(12) =117244a(13) =444107a(14) =1698959a(15) =6637212a(16) =25978768a(17) =103470800a(18) =413378548a(19) =1671251159a(20) =6788681873a(21) =27799009080a(22) =114434701571a(23) =473862635406
External references
- oeis: A151363