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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 1, 0)}.
A149257
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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =140a(6) =506a(7) =1927a(8) =7503a(9) =29250a(10) =117086a(11) =468853a(12) =1900132a(13) =7760754a(14) =31845147a(15) =131572404a(16) =545525029a(17) =2271965639a(18) =9501252616a(19) =39842385346a(20) =167671577223a(21) =707164381085
External references
- oeis: A149257