A207777 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 0 vertically

31, 961, 2040, 20104, 157472, 759482, 6513576, 49975640, 259077468, 2150453548, 15981869071, 87310201135, 709311394273, 5137197417469, 29284543214864, 233502033554208, 1657717100658198, 9791967204391982, 76739391151731042

Offset

1,1

Comments

Row 7 of A207774

Links

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

Example

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

Crossrefs

Sequence in context: A238993 A171336 A200442 * A207274 A207767 A207734

Adjacent sequences: A207774 A207775 A207776 * A207778 A207779 A207780

Keyword

nonn

Author

R. H. Hardin Feb 20 2012

Status

approved