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), (0, 1, -1), (1, 0, -1), (1, 0, 1)}.
A149328
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), (0, 1, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =39a(5) =142a(6) =545a(7) =2106a(8) =8382a(9) =34215a(10) =142643a(11) =600014a(12) =2557631a(13) =11028505a(14) =48020121a(15) =210769413a(16) =931363949a(17) =4143384678a(18) =18544445680a(19) =83436432216a(20) =377186393627
External references
- oeis: A149328