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), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
A150070
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), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =220a(6) =782a(7) =2824a(8) =10328a(9) =38306a(10) =142388a(11) =533832a(12) =2011048a(13) =7609034a(14) =28938148a(15) =110276428a(16) =421716538a(17) =1616589438a(18) =6211475088a(19) =23925481704a(20) =92285891638a(21) =356644978016
External references
- oeis: A150070