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, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
A149881
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, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =43a(5) =147a(6) =517a(7) =1903a(8) =7130a(9) =27368a(10) =107152a(11) =425071a(12) =1714426a(13) =6973676a(14) =28706751a(15) =119063914a(16) =497817611a(17) =2096560172a(18) =8878947340a(19) =37844245609a(20) =162013011858a(21) =697185486077
External references
- oeis: A149881