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, 1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149728
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, 1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =75a(5) =289a(6) =1321a(7) =5603a(8) =26151a(9) =115545a(10) =546467a(11) =2476781a(12) =11824411a(13) =54562395a(14) =262245791a(15) =1225932563a(16) =5921776307a(17) =27954464511a(18) =135555532109a(19) =644771630961
External references
- oeis: A149728