A267961 Number of n X 2 0..2 arrays with every repeated value in every row and column greater than the previous repeated value.

9, 81, 576, 3969, 25281, 155236, 915849, 5253264, 29365561, 160731684, 863478225, 4564353600, 23782266225, 122339052900, 622112365081, 3130733894544, 15606442349001, 77125175024836, 378120197667969, 1840241149473024

Offset: 1

Author

R. H. Hardin, Jan 22 2016

Keywords

• nonn

Comments

Column 2 of A267966.

Examples

			Some solutions for n=6
..0..1....0..0....1..2....2..0....0..1....1..2....0..1....1..2....2..2....0..0
..1..0....1..2....0..1....0..1....1..0....0..1....2..0....0..0....0..0....1..0
..0..1....0..1....0..1....1..1....2..2....1..2....2..1....1..0....0..0....0..2
..2..1....2..1....1..2....0..0....1..1....0..0....0..2....2..2....1..1....2..1
..0..2....0..0....0..2....2..1....0..0....2..2....2..0....1..2....0..2....0..2
..0..0....1..1....2..1....1..0....2..2....0..0....0..2....0..1....2..0....1..1
		

Links

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

Crossrefs

Cf. A267966.

Formula

Empirical: a(n) = 21*a(n-1) -153*a(n-2) +263*a(n-3) +2094*a(n-4) -9792*a(n-5) -2752*a(n-6) +86256*a(n-7) -85536*a(n-8) -338048*a(n-9) +554496*a(n-10) +571392*a(n-11) -1335296*a(n-12) -98304*a(n-13) +1179648*a(n-14) -524288*a(n-15).