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), (0, 1, 1), (1, 0, 1)}.
A150184
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), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =80a(5) =294a(6) =1178a(7) =4720a(8) =19796a(9) =81376a(10) =346368a(11) =1465122a(12) =6331534a(13) =27192882a(14) =118745262a(15) =516568790a(16) =2274700234a(17) =9991853262a(18) =44299962722a(19) =196064059838a(20) =874195069474
External references
- oeis: A150184