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, -1), (-1, 0), (-1, 1), (0, 1), (1, -1), (1, 1)}.
A151469
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, -1), (-1, 0), (-1, 1), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =55a(5) =224a(6) =1054a(7) =4855a(8) =23764a(9) =116491a(10) =587824a(11) =2988264a(12) =15439018a(13) =80389938a(14) =422931343a(15) =2240237896a(16) =11953324634a(17) =64141694737a(18) =346092872529
External references
- oeis: A151469