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, 0), (-1, 0, 1), (-1, 1, -1), (1, 0, -1), (1, 0, 1)}.
A149147
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, 0), (-1, 0, 1), (-1, 1, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =38a(5) =111a(6) =477a(7) =1593a(8) =6954a(9) =25101a(10) =111245a(11) =421669a(12) =1895942a(13) =7424769a(14) =33816664a(15) =135567201a(16) =624118470a(17) =2547578027a(18) =11830222149a(19) =48999526377a(20) =229130337164a(21) =960584070247
External references
- oeis: A149147