A250358 Number of length n arrays x(i), i=1..n with x(i) in i..i+5 and no value appearing more than 3 times.

6, 36, 216, 1293, 7712, 45866, 272760, 1621963, 9644496, 57346376, 340979312, 2027446948, 12055094608, 71678940042, 426199029864, 2534155836542, 15067950109140, 89593195408640, 532716168060704, 3167500770096043

Offset: 1

Author

R. H. Hardin, Nov 19 2014

Keywords

• nonn

Comments

Column 5 of A250361

Examples

			Some solutions for n=6
..4....5....2....0....1....1....3....0....1....4....2....0....2....3....1....3
..1....2....6....1....6....5....2....2....6....4....2....1....4....1....2....1
..7....6....5....7....6....6....4....7....4....7....2....7....3....7....3....2
..6....6....4....8....6....8....8....4....6....6....8....7....3....4....7....6
..4....6....5....4....9....7....8....8....4....5....9....9....6....4....6....7
.10....8....9....6....5....6....8....6...10....7....8....5....9....8....7....7
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 6*a(n-1) -4*a(n-4) -22*a(n-5) -130*a(n-6) +7*a(n-8) +50*a(n-9) +66*a(n-10) +a(n-12) -6*a(n-13)