Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (1, -1), (1, 0), (1, 1)}.
A151486
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =0a(2) =4a(3) =5a(4) =44a(5) =113a(6) =722a(7) =2597a(8) =14551a(9) =62444a(10) =332585a(11) =1569633a(12) =8236700a(13) =41010951a(14) =215319131a(15) =1106939210a(16) =5849532618a(17) =30697255765a(18) =163555279079a(19) =870659496839
External references
- oeis: A151486