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A228389 Number of nX7 binary arrays with top left value 1 and no two ones adjacent horizontally or vertically. 1
13, 169, 3513, 62546, 1177709, 21683149, 402968942, 7458864720, 138305554175, 2562514124813, 47494743530686, 880148347563002, 16311635295084771, 302290762813484314, 5602201879906920864, 103822064306056848780 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A228390

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +203*a(n-2) -210*a(n-3) -5659*a(n-4) +6975*a(n-5) +48558*a(n-6) -82823*a(n-7) -127405*a(n-8) +308107*a(n-9) +21372*a(n-10) -340142*a(n-11) +100779*a(n-12) +139011*a(n-13) -54187*a(n-14) -25564*a(n-15) +9369*a(n-16) +2227*a(n-17) -546*a(n-18) -87*a(n-19) +9*a(n-20) +a(n-21)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A045600 A001022 A195945 * A020533 A176596 A176023

Adjacent sequences:  A228386 A228387 A228388 * A228390 A228391 A228392

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 21 2013

STATUS

approved

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Last modified April 27 01:03 EDT 2018. Contains 303149 sequences. (Running on oeis4.)