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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
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: A287819 A001706 A368268 * A356239 A324413 A144745
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 01 2014
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)