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, 0, 0), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
A149937
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, 0, 0), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =168a(6) =601a(7) =2222a(8) =8413a(9) =32490a(10) =127623a(11) =508379a(12) =2049295a(13) =8347576a(14) =34315105a(15) =142197215a(16) =593480709a(17) =2492970426a(18) =10532763667a(19) =44735045029a(20) =190912796011a(21) =818327919384
External references
- oeis: A149937