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), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148623
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), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =59a(6) =232a(7) =794a(8) =3336a(9) =12721a(10) =55573a(11) =226145a(12) =1014025a(13) =4308738a(14) =19687857a(15) =86260599a(16) =399772916a(17) =1791614525a(18) =8394315873a(19) =38270944739a(20) =180858444718a(21) =835634742240
External references
- oeis: A148623