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, 0, -1), (1, 1, 1)}.
A149603
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, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =61a(5) =227a(6) =973a(7) =3937a(8) =17167a(9) =72373a(10) =321081a(11) =1391267a(12) =6240225a(13) =27514269a(14) =124476035a(15) =556062373a(16) =2532538727a(17) =11423137407a(18) =52302372255a(19) =237698999627
External references
- oeis: A149603