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A146823 Number of n X n binary arrays with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 9, 33, 81, 501, 9765, 253829, 5201161, 149256829, 9047294209, 886839186693, 108530571403501 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.1.1.0.0

.0.1.1.1.0.1.1.1

.0.1.0.0.0.1.0.0

.0.1.0.0.0.1.0.0

.1.0.0.0.0.0.1.0

.1.1.1.1.0.0.1.0

.0.1.0.0.1.1.1.0

.0.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A273316 A101990 A147170 * A147027 A146256 A005920

Adjacent sequences:  A146820 A146821 A146822 * A146824 A146825 A146826

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 23 02:17 EDT 2022. Contains 353959 sequences. (Running on oeis4.)