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, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149686
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, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =265a(6) =1131a(7) =4857a(8) =21329a(9) =94581a(10) =424745a(11) =1924785a(12) =8795455a(13) =40463533a(14) =187211429a(15) =870344139a(16) =4063871607a(17) =19049610529a(18) =89612140117a(19) =422866088555
External references
- oeis: A149686