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A251284 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally 1
9, 71, 822, 18924, 577942, 39473392, 3232216177, 648994836940, 144605658061843, 84335072845188126, 51747558531570898082, 86717653225766506442744, 147921009780997938189659172, 706047665638030677246299851962 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A251292

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A057080 A287819 A001706 * A324413 A144745 A158193

Adjacent sequences:  A251281 A251282 A251283 * A251285 A251286 A251287

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified November 13 00:25 EST 2019. Contains 329083 sequences. (Running on oeis4.)