A207687 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 1 vertically

25, 625, 1292, 4174, 9450, 25076, 65564, 171382, 433468, 1150747, 2968284, 7722348, 19756486, 52194634, 134386810, 348854340, 903166514, 2358439491, 6101183894, 15824652924, 41067569740, 106834907856, 276798237718, 718012247867

Offset

1,1

Comments

Row 7 of A207682

Links

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

Example

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

Crossrefs

Sequence in context: A207698 A207594 A207513 * A207345 A207487 A207268

Adjacent sequences: A207684 A207685 A207686 * A207688 A207689 A207690

Keyword

nonn

Author

R. H. Hardin Feb 19 2012

Status

approved