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), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
A150128
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), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =71a(5) =270a(6) =1059a(7) =4287a(8) =17778a(9) =74969a(10) =321429a(11) =1394925a(12) =6119233a(13) =27101195a(14) =120957641a(15) =543776146a(16) =2459693080a(17) =11187357445a(18) =51139563339a(19) =234798585044
External references
- oeis: A150128