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, 0, 1), (0, 1, -1), (1, 0, 1)}.
A149325
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, 0, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =38a(5) =142a(6) =517a(7) =1951a(8) =7513a(9) =29512a(10) =117109a(11) =467749a(12) =1895238a(13) =7712705a(14) =31588149a(15) =130133561a(16) =538672492a(17) =2239216530a(18) =9339478963a(19) =39101989768a(20) =164180421600a(21) =691191046990
External references
- oeis: A149325