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), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
A149667
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), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =63a(5) =251a(6) =1021a(7) =4229a(8) =17763a(9) =75495a(10) =324419a(11) =1405651a(12) =6129959a(13) =26885263a(14) =118546757a(15) =525145593a(16) =2335550797a(17) =10423483181a(18) =46668994497a(19) =209568731239a(20) =943579928523
External references
- oeis: A149667