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, 1), (0, 0, -1), (1, 1, 1)}.
A149237
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, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =36a(5) =114a(6) =392a(7) =1319a(8) =4572a(9) =15806a(10) =55800a(11) =196414a(12) =698936a(13) =2488452a(14) =8935696a(15) =32093615a(16) =115879740a(17) =418874694a(18) =1520690456a(19) =5525783450a(20) =20139817064a(21) =73488506268a(22) =268834264688a(23) =984430431638
External references
- oeis: A149237