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, 0, 1), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
A149915
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, 0, 1), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =155a(6) =535a(7) =1903a(8) =6939a(9) =25811a(10) =97548a(11) =373748a(12) =1448881a(13) =5673375a(14) =22408892a(15) =89180910a(16) =357297116a(17) =1440071723a(18) =5835251538a(19) =23758746695a(20) =97156064567a(21) =398866291815
External references
- oeis: A149915