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, 0, 1), (1, -1, 0), (1, 0, 0), (1, 1, -1)}.
A148199
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, 0, 1), (1, -1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =33a(6) =109a(7) =342a(8) =1226a(9) =4201a(10) =15742a(11) =57080a(12) =221634a(13) =837409a(14) =3332844a(15) =12983589a(16) =52719344a(17) =210307546a(18) =867369706a(19) =3526066972a(20) =14731903807a(21) =60815029670a(22) =256818485041
External references
- oeis: A148199