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, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150160
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, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =75a(5) =281a(6) =1140a(7) =4553a(8) =19070a(9) =79211a(10) =339345a(11) =1443963a(12) =6293297a(13) =27237166a(14) =120173370a(15) =526927586a(16) =2346463311a(17) =10393195395a(18) =46629996570a(19) =208201003414a(20) =939887637241
External references
- oeis: A150160