A183343 - OEIS

A183343

Number of n X n binary arrays with each 1 adjacent to exactly one 0 vertically and one 0 horizontally.

1, 7, 16, 63, 594, 6388, 88177, 2078075, 67448514, 3011210310, 200949643314, 19152543505058, 2587734793386622, 506430044756068101, 142259297693953559997, 57178237320333047697665

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

OFFSET

1,2

COMMENTS

Diagonal of A183352.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for 5 X 5

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

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

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

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

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

CROSSREFS

Cf. A183352.

Sequence in context: A056613 A318413 A342873 * A318481 A215180 A309476

Adjacent sequences: A183340 A183341 A183342 * A183344 A183345 A183346

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2011

STATUS

approved