A207425 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically

40, 1600, 20550, 241087, 3210938, 39698733, 474552171, 5755114104, 69609375870, 836438494500, 10061632597765, 121113950382680, 1456404024212421, 17511407393280395, 210603058946646014, 2532582001420108242

Offset

1,1

Comments

Column 7 of A207426

Links

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

Example

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

Crossrefs

Sequence in context: A207907 A208038 A207857 * A207740 A208082 A009984

Adjacent sequences: A207422 A207423 A207424 * A207426 A207427 A207428

Keyword

nonn

Author

R. H. Hardin Feb 17 2012

Status

approved