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, -1), (1, 1)}.
A151304
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, -1), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =32a(4) =139a(5) =612a(6) =2780a(7) =12777a(8) =59474a(9) =279119a(10) =1319587a(11) =6272549a(12) =29957777a(13) =143629361a(14) =690899877a(15) =3332790064a(16) =16116297361a(17) =78099554494a(18) =379183671290
External references
- oeis: A151304