A274754 Number of 7Xn 0..2 arrays with no element equal to any value at offset (-1,-2) (0,-1) or (-1,0) and new values introduced in order 0..2.

32, 729, 10946, 185435, 3140840, 53680592, 920432562, 15806543610, 271711836855, 4671914239590, 80354505513874, 1382068876451987, 23773417216542030, 408926400535170333, 7034177852486985161, 120997474917708497554

Offset: 1

Author

R. H. Hardin, Jul 04 2016

Keywords

• nonn

Comments

Row 7 of A274749.

Examples

			Some solutions for n=4
..0..1..0..1. .0..1..0..2. .0..1..0..2. .0..1..0..1. .0..1..0..1
..1..2..1..0. .2..0..1..0. .2..0..1..0. .2..0..1..2. .1..2..1..2
..2..1..0..1. .0..1..0..1. .0..1..0..1. .0..1..0..1. .2..1..0..1
..1..0..1..2. .2..0..2..0. .1..0..2..0. .1..2..1..0. .0..2..1..2
..0..1..2..1. .1..2..0..1. .0..1..0..1. .0..1..2..1. .1..0..2..0
..1..0..1..0. .0..1..2..0. .1..2..1..2. .1..0..1..2. .0..1..0..2
..2..1..2..1. .2..0..1..2. .2..0..2..1. .0..1..2..1. .2..0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 80

Crossrefs

Cf. A274749.

Formula

Empirical recurrence of order 80 (see link above)