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), (0, 1), (1, -1), (1, 0), (1, 1)}.
A151321
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), (0, 1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =59a(4) =279a(5) =1341a(6) =6527a(7) =31995a(8) =157659a(9) =779601a(10) =3864985a(11) =19197119a(12) =95485691a(13) =475450235a(14) =2369357063a(15) =11815028649a(16) =58946549799a(17) =294208885315
External references
- oeis: A151321