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, 0, 1), (-1, 1, 0), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149807
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, 0, 1), (-1, 1, 0), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =91a(5) =391a(6) =1911a(7) =8745a(8) =43137a(9) =203109a(10) =1007333a(11) =4824961a(12) =24002669a(13) =116213005a(14) =579167005a(15) =2824572587a(16) =14092358951a(17) =69080511535a(18) =344899330975
External references
- oeis: A149807