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), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.
A149987
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), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =57a(5) =197a(6) =727a(7) =2749a(8) =10399a(9) =40301a(10) =159574a(11) =631160a(12) =2522298a(13) =10221848a(14) =41531613a(15) =169372736a(16) =696855374a(17) =2879429468a(18) =11915981127a(19) =49573590322a(20) =207133252404a(21) =866652990044
External references
- oeis: A149987