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, 0)}.
A151296
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, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =104a(5) =436a(6) =1878a(7) =8285a(8) =37144a(9) =168793a(10) =775209a(11) =3591445a(12) =16760364a(13) =78696089a(14) =371450137a(15) =1761190032a(16) =8383369989a(17) =40042977165a(18) =191846857887a(19) =921629216986
External references
- oeis: A151296