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, 0), (0, -1, 1), (1, 0, -1), (1, 1, 1)}.
A149699
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, 0), (0, -1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =271a(6) =1143a(7) =4861a(8) =21075a(9) =92001a(10) =405747a(11) =1803693a(12) =8071737a(13) =36317843a(14) =164127723a(15) =744693295a(16) =3390805227a(17) =15488141433a(18) =70940866119a(19) =325734483267
External references
- oeis: A149699