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, 1, -1), (-1, 1, 1), (1, -1, 0), (1, 1, 1)}.
A149573
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, 1, -1), (-1, 1, 1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =63a(5) =203a(6) =1007a(7) =3611a(8) =17913a(9) =68165a(10) =339541a(11) =1344553a(12) =6700861a(13) =27275037a(14) =136111539a(15) =565638663a(16) =2823615477a(17) =11921534499a(18) =59544108915a(19) =254620915051
External references
- oeis: A149573