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), (1, 0, -1), (1, 1, 1)}.
A149444
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), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =48a(5) =168a(6) =636a(7) =2341a(8) =8948a(9) =33736a(10) =129848a(11) =496244a(12) =1919692a(13) =7398884a(14) =28733712a(15) =111379685a(16) =433879716a(17) =1688721596a(18) =6594895460a(19) =25747056524a(20) =100757483924a(21) =394306275440
External references
- oeis: A149444