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A181038 Number of nX4 binary matrices with no initial bit string in any row or column divisible by 6 0
1, 6, 18, 108, 410, 2128, 8877, 42883, 186732, 872119, 3875520, 17814874, 79942755, 364719182, 1644428972, 7475300460, 33782717781, 153302897126, 693611114280, 3144849890670 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A181039

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for 6X4

..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1

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

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

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

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

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

CROSSREFS

Sequence in context: A151470 A009573 A052655 * A222857 A108735 A143556

Adjacent sequences:  A181035 A181036 A181037 * A181039 A181040 A181041

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved

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Last modified December 22 10:11 EST 2014. Contains 252339 sequences.