A213465 Number of 0..3 arrays of length 2*n with sum less than 3*n in any length 2n subsequence (=less than 50% duty cycle).

6, 106, 1758, 28722, 466136, 7536790, 121573668, 1957953138, 31497261096, 506264941416, 8132104116670, 130559338628190, 2095252193645448, 33614011364219588, 539119053140521448, 8644670545679274098

Offset: 1

Author

R. H. Hardin Jun 12 2012

Keywords

• nonn

Comments

Row 1 of A213464

Examples

			Some solutions for n=3
..0....1....2....1....2....1....0....1....3....0....2....1....3....0....3....2
..2....2....1....2....0....1....2....1....2....2....0....2....0....1....0....0
..0....1....1....0....0....1....1....0....1....3....2....3....1....3....1....0
..0....1....1....1....1....2....0....2....0....1....3....1....0....0....3....1
..0....2....1....2....0....0....3....2....1....2....0....1....0....2....0....2
..2....1....0....0....3....3....0....2....0....0....0....0....1....2....0....1
		

Links

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