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, 0), (-1, 1, 0), (1, 0, -1), (1, 0, 1)}.
A149280
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, 0), (-1, 1, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =44a(5) =135a(6) =591a(7) =2097a(8) =9384a(9) =34617a(10) =159023a(11) =618011a(12) =2876682a(13) =11453085a(14) =53921126a(15) =219972045a(16) =1043981584a(17) =4329841785a(18) =20681051513a(19) =86993499457a(20) =417637003298
External references
- oeis: A149280