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, 1, -1), (-1, 1, 1), (0, 0, 1), (1, 0, 0)}.
A149939
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, 1, -1), (-1, 1, 1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =170a(6) =619a(7) =2302a(8) =8723a(9) =33708a(10) =132118a(11) =524213a(12) =2099108a(13) =8469819a(14) =34428721a(15) =140827947a(16) =579195024a(17) =2393319428a(18) =9930326669a(19) =41361965397a(20) =172876964154a(21) =724796212419
External references
- oeis: A149939