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, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
A148978
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, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =112a(6) =411a(7) =1590a(8) =6222a(9) =25025a(10) =101745a(11) =419657a(12) =1754602a(13) =7393290a(14) =31469686a(15) =134868306a(16) =581903908a(17) =2526957737a(18) =11027258271a(19) =48371185519a(20) =213096893682a(21) =942519761900
External references
- oeis: A148978