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, 1, -1), (1, 1, 1)}.
A149623
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, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =65a(5) =261a(6) =1107a(7) =4829a(8) =21161a(9) =94699a(10) =427839a(11) =1944321a(12) =8940873a(13) =41227359a(14) =191537351a(15) =893670483a(16) =4185275627a(17) =19689481625a(18) =92872490315a(19) =439533572969
External references
- oeis: A149623