A267790 Number of 4Xn 0..1 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

9, 81, 729, 5081, 34173, 211555, 1262760, 7263481, 40755550, 223936008, 1210708628, 6459502002, 34095465344, 178380596163, 926424208370, 4781950926795, 24555731443566, 125543243787981, 639444488484051

Offset: 1

Author

R. H. Hardin, Jan 20 2016

Keywords

• nonn

Comments

Row 4 of A267788.

Examples

			Some solutions for n=4
..1..1..1..0....0..1..0..1....0..0..0..1....0..1..1..0....0..0..1..1
..0..0..0..0....1..0..1..0....0..1..0..1....0..0..0..1....1..0..1..0
..1..1..1..1....1..0..0..1....1..1..1..0....1..0..0..1....0..1..0..0
..0..1..0..0....0..1..0..1....0..0..0..1....1..1..1..0....0..1..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 93

Crossrefs

Cf. A267788.

Formula

Empirical recurrence of order 93 (see link above)