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), (0, 1), (1, -1), (1, 0)}.
A151288
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), (0, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =84a(5) =336a(6) =1392a(7) =5912a(8) =25580a(9) =112324a(10) =499312a(11) =2242188a(12) =10154664a(13) =46324964a(14) =212664488a(15) =981653620a(16) =4553218968a(17) =21209894268a(18) =99178882232a(19) =465362985740
External references
- oeis: A151288