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, 1, 0), (0, 0, -1), (1, 0, -1), (1, 0, 1)}.
A149255
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, 1, 0), (0, 0, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =139a(6) =541a(7) =2123a(8) =8514a(9) =35349a(10) =148745a(11) =633783a(12) =2732576a(13) =11894507a(14) =52376280a(15) =232056273a(16) =1035710608a(17) =4649529099a(18) =20991138469a(19) =95287175913a(20) =434297949028
External references
- oeis: A149255