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, -1, 0), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
A150183
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, -1, 0), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =80a(5) =294a(6) =1168a(7) =4700a(8) =19616a(9) =80936a(10) =341652a(11) =1451138a(12) =6240682a(13) =26900956a(14) =116808978a(15) =509503870a(16) =2235781132a(17) =9846065742a(18) =43506965704a(19) =192855619628a(20) =857932000186
External references
- oeis: A150183