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A228688 Number of 7Xn binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally. 1
128, 577, 21305, 176032, 4008817, 44171841, 806190208, 10258304689, 168184756793, 2301665823616, 35784406285057, 508094306671233, 7692715116119040, 111277331056067617, 1662525457133097145 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A228683

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +184*a(n-2) -1201*a(n-3) -7155*a(n-4) +46048*a(n-5) +70745*a(n-6) -591673*a(n-7) -154744*a(n-8) +3207657*a(n-9) -715173*a(n-10) -7580648*a(n-11) +3369552*a(n-12) +7114920*a(n-13) -3800952*a(n-14) -1923264*a(n-15) +1083456*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A223316 A123293 A188864 * A231529 A197708 A198072

Adjacent sequences:  A228685 A228686 A228687 * A228689 A228690 A228691

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 30 2013

STATUS

approved

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Last modified May 18 18:42 EDT 2022. Contains 353824 sequences. (Running on oeis4.)