A203497 Number of 7Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns

3, 2050, 1107888, 1004305424, 1022868051652, 1172134178554204

Offset

1,1

Comments

Row 7 of A203491

Links

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

Example

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

Crossrefs

Sequence in context: A024047 A102987 A004814 * A145700 A286978 A293086

Adjacent sequences: A203494 A203495 A203496 * A203498 A203499 A203500

Keyword

nonn

Author

R. H. Hardin Jan 02 2012

Status

approved