A267643 Number of nX7 0..1 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.

15, 450, 2829, 32303, 128441, 1117207, 3696933, 30649693, 90914453, 784186403, 2141552549, 19980003873, 50876741513, 520249434779, 1246972578665, 13942225071453, 31756214522413, 383944691019691, 839150694697605

Offset

1,1

Comments

Column 7 of A267644.

Links

R. H. Hardin, Table of n, a(n) for n = 1..96

Example

Some solutions for n=5
..0..0..1..1..0..0..1....0..1..1..0..1..0..1....0..1..0..1..0..1..1
..1..1..0..0..1..0..1....1..0..0..1..0..1..0....1..0..1..0..1..0..1
..0..0..1..1..0..1..0....0..0..1..0..1..0..1....0..1..0..1..1..0..0
..1..0..1..0..0..1..0....1..1..0..1..0..1..0....1..0..1..0..0..1..1
..1..1..0..0..1..0..1....1..1..0..0..1..0..1....1..1..0..1..0..1..0

Crossrefs

Cf. A267644.

Sequence in context: A256194 A247141 A068203 * A267666 A020285 A041423

Adjacent sequences: A267640 A267641 A267642 * A267644 A267645 A267646

Keyword

nonn

Author

R. H. Hardin, Jan 18 2016

Status

approved