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), (0, 1, 1), (1, 0, -1), (1, 0, 0)}.
A150256
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), (0, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =86a(5) =351a(6) =1485a(7) =6478a(8) =28713a(9) =129042a(10) =588514a(11) =2708295a(12) =12557849a(13) =58662225a(14) =275720032a(15) =1301957755a(16) =6175003647a(17) =29407202465a(18) =140504779697a(19) =673271238707
External references
- oeis: A150256