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), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
A149992
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), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =57a(5) =207a(6) =770a(7) =2956a(8) =11511a(9) =45389a(10) =181551a(11) =732140a(12) =2975463a(13) =12172039a(14) =50107475a(15) =207221750a(16) =860713442a(17) =3589342898a(18) =15020205470a(19) =63043294686a(20) =265353326080
External references
- oeis: A149992