A207508 - OEIS

A207508

Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 1 vertically.

2, 16, 72, 438, 2638, 10340, 50322, 221672, 938572, 4001444, 16081184, 65882872, 265536422, 1041167756, 4136910380, 16075083164, 62441083194, 240925209706, 924668629616, 3528820338804, 13446998876758, 50858295309890

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A207514.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..24

EXAMPLE

Some solutions for n=4

..1..1..0..1....1..0..1..0....0..1..0..0....1..1..0..1....1..0..0..1

..1..1..1..1....0..1..0..1....0..0..1..0....1..0..1..0....1..1..0..1

..0..0..1..0....1..0..1..0....0..1..0..0....0..1..0..0....0..1..0..0

..0..1..0..0....1..1..0..1....0..1..0..0....0..0..1..0....1..0..0..1

CROSSREFS

Cf. A207514.

Sequence in context: A207874 A208374 A207677 * A208063 A207923 A207839

Adjacent sequences: A207505 A207506 A207507 * A207509 A207510 A207511

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2012

STATUS

approved