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, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149668
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, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =63a(5) =251a(6) =1043a(7) =4371a(8) =18559a(9) =79941a(10) =349383a(11) =1537855a(12) =6806337a(13) =30316873a(14) =135889101a(15) =611946453a(16) =2765753127a(17) =12542616357a(18) =57076733891a(19) =260535260195
External references
- oeis: A149668