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, 1), (0, 0, -1), (0, 1, -1), (1, 1, 1)}.
A149696
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, 1), (0, 0, -1), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =249a(6) =1117a(7) =4529a(8) =19893a(9) =82313a(10) =373677a(11) =1609825a(12) =7263205a(13) =31601529a(14) =144929117a(15) =643356881a(16) =2943504405a(17) =13142716521a(18) =60720099853a(19) =274355968577
External references
- oeis: A149696