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, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.
A149321
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, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =37a(5) =141a(6) =507a(7) =1889a(8) =7323a(9) =28670a(10) =112755a(11) =451118a(12) =1827782a(13) =7401042a(14) =30296921a(15) =124896792a(16) =515790235a(17) =2142127204a(18) =8938773789a(19) =37392751211a(20) =156893791500a(21) =660687389365
External references
- oeis: A149321