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, -1), (0, 0, 1), (1, -1, 0), (1, 0, 1)}.
A149886
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, -1), (0, 0, 1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =44a(5) =151a(6) =535a(7) =1966a(8) =7405a(9) =28505a(10) =111882a(11) =445422a(12) =1797142a(13) =7332214a(14) =30198501a(15) =125470041a(16) =525231650a(17) =2213565832a(18) =9386623606a(19) =40022351833a(20) =171504142188a(21) =738310563738
External references
- oeis: A149886