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, -1, 0), (1, 1, -1)}.
A148995
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, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =117a(6) =453a(7) =1775a(8) =7112a(9) =28983a(10) =120132a(11) =504174a(12) =2146646a(13) =9208343a(14) =39778905a(15) =173078627a(16) =757217899a(17) =3328960216a(18) =14708426707a(19) =65283892983a(20) =291015312216
External references
- oeis: A148995