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, 0), (0, 1), (1, 0), (1, 1)}.
A151318
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, 0), (0, 1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =55a(4) =249a(5) =1131a(6) =5253a(7) =24543a(8) =115825a(9) =549331a(10) =2620029a(11) =12543367a(12) =60270697a(13) =290423355a(14) =1403088885a(15) =6793370415a(16) =32956254945a(17) =160152588195a(18) =779470975725
External references
- oeis: A151318