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), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
A149446
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), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =48a(5) =174a(6) =664a(7) =2513a(8) =9730a(9) =37582a(10) =147038a(11) =574446a(12) =2260814a(13) =8893738a(14) =35148964a(15) =138890385a(16) =550442708a(17) =2181637152a(18) =8663905570a(19) =34411664264a(20) =136862355144a(21) =544428822504
External references
- oeis: A149446