A203563 Number of nX7 0..2 arrays with row sums equal and column sums equal

3, 395, 35619, 7343451, 1509893003, 360255871643

Offset

1,1

Comments

Column 7 of A203564

Links

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

Example

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

Crossrefs

Sequence in context: A244670 A199146 A137023 * A181990 A198666 A377032

Adjacent sequences: A203560 A203561 A203562 * A203564 A203565 A203566

Keyword

nonn

Author

R. H. Hardin Jan 03 2012

Status

approved