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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
A150227
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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =87a(5) =320a(6) =1378a(7) =5734a(8) =24390a(9) =104847a(10) =468509a(11) =2014677a(12) =9086639a(13) =40512331a(14) =181514161a(15) =817438205a(16) =3739814457a(17) =16804267343a(18) =77203662737a(19) =352969349528
External references
- oeis: A150227