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), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
A148836
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), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =90a(6) =314a(7) =1128a(8) =4153a(9) =15645a(10) =59702a(11) =230787a(12) =903001a(13) =3564992a(14) =14204743a(15) =57014847a(16) =230396765a(17) =936783710a(18) =3828965482a(19) =15730767884a(20) =64921356490a(21) =269039650977
External references
- oeis: A148836