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, 0, 0), (0, -1, 1), (0, 1, -1), (1, -1, 1), (1, 0, 1)}.
A148970
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, 0, 0), (0, -1, 1), (0, 1, -1), (1, -1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =110a(6) =413a(7) =1586a(8) =6338a(9) =25587a(10) =105668a(11) =441742a(12) =1869009a(13) =7988512a(14) =34452295a(15) =149655845a(16) =654683791a(17) =2880468569a(18) =12740749488a(19) =56624461023a(20) =252720799653
External references
- oeis: A148970