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, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148267
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, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =39a(6) =135a(7) =382a(8) =1543a(9) =4843a(10) =18881a(11) =60918a(12) =256074a(13) =874174a(14) =3590229a(15) =12412052a(16) =53420218a(17) =191510935a(18) =810050590a(19) =2923309230a(20) =12779202552a(21) =47321530017a(22) =204011303079a(23) =758221407024
External references
- oeis: A148267