Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (0, 0, -1), (1, 0, 0), (1, 1, 1)}.
A150765
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (0, 0, -1), (1, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =30a(4) =126a(5) =539a(6) =2358a(7) =10526a(8) =47621a(9) =217182a(10) =1002081a(11) =4644109a(12) =21682588a(13) =101701604a(14) =478985355a(15) =2265535437a(16) =10747214934a(17) =51142755153a(18) =244020287947
External references
- oeis: A150765