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, 0), (1, -1, -1), (1, 1, -1), (1, 1, 0)}.
A148637
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, 0), (1, -1, -1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =61a(6) =227a(7) =721a(8) =2787a(9) =9666a(10) =38536a(11) =140765a(12) =573595a(13) =2173584a(14) =9013346a(15) =35145343a(16) =147772519a(17) =589214977a(18) =2505119741a(19) =10168189527a(20) =43634082045a(21) =179723654395a(22) =777338999095
External references
- oeis: A148637