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, 0), (-1, 1, -1), (0, 1, 0), (0, 1, 1), (1, -1, -1)}.
A149871
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, 0), (-1, 1, -1), (0, 1, 0), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =42a(5) =138a(6) =482a(7) =1674a(8) =6193a(9) =22905a(10) =87302a(11) =332124a(12) =1300396a(13) =5086323a(14) =20241313a(15) =80532296a(16) =325512139a(17) =1315265248a(18) =5373186309a(19) =21959388097a(20) =90618415683a(21) =374030443628
External references
- oeis: A149871