A263365 Number of (n+1)X(n+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.

1, 2, 82, 24711, 84790557, 2535097569590

Offset

1,2

Comments

Diagonal of A263373.

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Cf. A263373.

Sequence in context: A246002 A063270 A087617 * A140157 A285689 A139867

Adjacent sequences: A263362 A263363 A263364 * A263366 A263367 A263368

Keyword

nonn

Author

R. H. Hardin, Oct 16 2015

Status

approved