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, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149687
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, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =265a(6) =1137a(7) =4875a(8) =21467a(9) =95215a(10) =428683a(11) =1944223a(12) =8893637a(13) =40933241a(14) =189515283a(15) =881580035a(16) =4118933539a(17) =19316869649a(18) =90903013951a(19) =429081904665
External references
- oeis: A149687