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A228654 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally. 1
1, 2, 34, 416, 24109, 1482892, 337258048, 99770848656, 92600434253746, 128571982215641568, 497887042842429868023, 3189515020018986830642404, 52334113476786453501159739264, 1527284319716267796002249895255726 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A228660

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..29

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A224294 A092408 A180764 * A005261 A104898 A218432

Adjacent sequences:  A228651 A228652 A228653 * A228655 A228656 A228657

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 29 2013

STATUS

approved

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Last modified January 28 07:07 EST 2020. Contains 331317 sequences. (Running on oeis4.)