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A228476 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally. 6
1, 2, 14, 172, 4354, 211588, 20185842, 3737615288, 1349721589622, 948593164919044, 1298594593323021084, 3461591189556243601228, 17969903126848842785918376, 181660279488635404176787338286 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A228482

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..27

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A046247 A141012 A235369 * A233224 A167014 A300282

Adjacent sequences:  A228473 A228474 A228475 * A228477 A228478 A228479

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 22 2013

STATUS

approved

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Last modified November 13 02:46 EST 2018. Contains 317121 sequences. (Running on oeis4.)