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, 0), (-1, 1, 0), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149677
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, 0), (-1, 1, 0), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =65a(5) =273a(6) =1141a(7) =4913a(8) =21757a(9) =95985a(10) =434329a(11) =1968573a(12) =8998853a(13) =41513797a(14) =191940185a(15) =893808309a(16) =4177271209a(17) =19586280777a(18) =92245079185a(19) =435366093701
External references
- oeis: A149677