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, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
A149849
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, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =14a(4) =46a(5) =144a(6) =540a(7) =1952a(8) =7066a(9) =27326a(10) =104192a(11) =402370a(12) =1583626a(13) =6253532a(14) =24935669a(15) =99650433a(16) =402653095a(17) =1634611082a(18) =6627794165a(19) =27175594747a(20) =111655473179a(21) =458521078228
External references
- oeis: A149849