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, -1), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
A149597
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, -1), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =59a(5) =223a(6) =971a(7) =4017a(8) =17717a(9) =76441a(10) =345973a(11) =1538209a(12) =7065229a(13) =31973001a(14) =148448869a(15) =681356587a(16) =3191805359a(17) =14808199315a(18) =69832629095a(19) =326627084291
External references
- oeis: A149597