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A188829 Number of 7Xn binary arrays without the pattern 0 1 diagonally or antidiagonally 1
128, 64, 224, 784, 2800, 10000, 36000, 129600, 468000, 1690000, 6110000, 22090000, 79900000, 289000000, 1045500000, 3782250000, 13683750000, 49506250000, 179112500000, 648025000000, 2344562500000, 8482656250000, 30690468750000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A188824

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 5*a(n-1) -25*a(n-3) +25*a(n-4) for n>5

EXAMPLE

Some solutions for 7X3

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A121374 A252487 A160638 * A172532 A173779 A187353

Adjacent sequences:  A188826 A188827 A188828 * A188830 A188831 A188832

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 11 2011

STATUS

approved

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Last modified June 28 04:43 EDT 2017. Contains 288813 sequences.