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), (0, 1, -1), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.
A149836
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), (0, 1, -1), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =30a(5) =96a(6) =331a(7) =1182a(8) =4330a(9) =16440a(10) =63666a(11) =250784a(12) =1006836a(13) =4092702a(14) =16835669a(15) =70046157a(16) =293951828a(17) =1244027689a(18) =5304687807a(19) =22764368479a(20) =98291087090a(21) =426708971095
External references
- oeis: A149836