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, 1, -1), (0, 1, 0), (1, 0, 0)}.
A149967
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, 1, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =54a(5) =196a(6) =748a(7) =2922a(8) =11764a(9) =48257a(10) =200935a(11) =849121a(12) =3625331a(13) =15628210a(14) =67938649a(15) =297346382a(16) =1309702755a(17) =5800241925a(18) =25810702835a(19) =115363553879a(20) =517624990200
External references
- oeis: A149967