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), (-1, 0, 1), (0, 1, -1), (1, -1, 1), (1, 0, 0)}.
A148572
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), (-1, 0, 1), (0, 1, -1), (1, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =19a(5) =54a(6) =183a(7) =632a(8) =2307a(9) =8753a(10) =34000a(11) =135893a(12) =552498a(13) =2288861a(14) =9619432a(15) =40955833a(16) =176439889a(17) =767614597a(18) =3370686080a(19) =14919375855a(20) =66519132927a(21) =298537169659
External references
- oeis: A148572