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, 0), (1, 0, 0), (1, 1, -1)}.
A149979
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, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =58a(5) =223a(6) =903a(7) =3779a(8) =16193a(9) =70818a(10) =314743a(11) =1416706a(12) =6446429a(13) =29598120a(14) =136933180a(15) =637675007a(16) =2986393015a(17) =14055119005a(18) =66436372277a(19) =315240014710
External references
- oeis: A149979