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

1,1

Comments

Column 3 of A263373.

Links

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

Example

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

Crossrefs

Cf. A263373.

Sequence in context: A071409 A232041 A135756 * A208806 A319144 A111822

Adjacent sequences: A263365 A263366 A263367 * A263369 A263370 A263371

Keyword

nonn

Author

R. H. Hardin, Oct 16 2015

Status

approved