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, 1), (-1, 0), (0, 1), (1, -1), (1, 0)}.
A151298
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, 1), (-1, 0), (0, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =28a(4) =118a(5) =531a(6) =2468a(7) =11803a(8) =57684a(9) =286757a(10) =1446170a(11) =7379881a(12) =38043130a(13) =197822526a(14) =1036473665a(15) =5466733758a(16) =29003678329a(17) =154689197699a(18) =828926263122
External references
- oeis: A151298