A207523 Number of 7Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically

42, 1764, 12994, 101233, 991184, 7666319, 54373655, 406281454, 2956097240, 20771578816, 146736632823, 1035899791894, 7243867291833, 50585923578789, 353460807485988, 2464610891088612, 17167716757793554, 119597858516828559

Offset

1,1

Comments

Row 7 of A207519

Links

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

Example

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

Crossrefs

Sequence in context: A207922 A208702 A207471 * A207258 A207953 A207862

Adjacent sequences: A207520 A207521 A207522 * A207524 A207525 A207526

Keyword

nonn

Author

R. H. Hardin Feb 18 2012

Status

approved