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A228682 Number of nX7 binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally. 1
34, 508, 8832, 152048, 2644336, 46125216, 806190208, 14105294112, 246929287360, 4324094979072, 75733743499264, 1326545935320192, 23236786328620160, 407043788171511808, 7130373880883372800, 124906998542616448512 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A228683

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 30*a(n-1) -226*a(n-2) -108*a(n-3) +4324*a(n-4) -1612*a(n-5) -27016*a(n-6) -2240*a(n-7) +50112*a(n-8) +20032*a(n-9) -16768*a(n-10) -4864*a(n-11) +2048*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A302383 A303104 A066291 * A020929 A160279 A230332

Adjacent sequences:  A228679 A228680 A228681 * A228683 A228684 A228685

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 30 2013

STATUS

approved

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Last modified December 3 21:17 EST 2021. Contains 349468 sequences. (Running on oeis4.)