Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 4 with the steps (1,0), (0, 1), (2,0) and (0,2).
A127618
Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 4 with the steps (1,0), (0, 1), (2,0) and (0,2).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =22a(4) =117a(5) =590a(6) =3018a(7) =15378a(8) =78440a(9) =399992a(10) =2039852a(11) =10402480a(12) =53049048a(13) =270531368a(14) =1379614800a(15) =7035549312a(16) =35878823312a(17) =182969359520a(18) =933079279328
External references
- oeis: A127618