A263368 Number of (n+1)X(3+1) 0..2 arrays with each row and column divisible by 7, read as a base-3 number with top and left being the most significant digits.

2, 7, 82, 865, 9888, 107514, 1260442, 15048493, 180640864, 2167406803, 26004426192, 311958557356, 3743219626994, 44918305209517, 539021844275470, 6468267502547329, 77619174191856096, 931428840572850954

Offset: 1

Author

R. H. Hardin, Oct 16 2015

Keywords

• nonn

Comments

Column 3 of A263373.

Examples

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

Links

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

Crossrefs

Cf. A263373.