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, 0, 1), (-1, 1, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.
A149493
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, 0, 1), (-1, 1, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =14a(4) =60a(5) =251a(6) =1120a(7) =5034a(8) =23167a(9) =107491a(10) =504444a(11) =2382474a(12) =11326009a(13) =54091015a(14) =259422990a(15) =1248388483a(16) =6025296992a(17) =29153344429a(18) =141368541183a(19) =686821433084
External references
- oeis: A149493