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, 0, 1), (0, 1, 1), (1, 0, -1)}.
A150107
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, 0, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =69a(5) =258a(6) =1014a(7) =4082a(8) =16800a(9) =70383a(10) =299011a(11) =1284372a(12) =5572651a(13) =24374059a(14) =107358625a(15) =475819313a(16) =2120059036a(17) =9490995387a(18) =42668497139a(19) =192542510134a(20) =871799541820
External references
- oeis: A150107