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A146833 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 317, 317, 3643, 3643, 63437, 63437, 1864637, 1864637, 68228177, 68228177 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.0.0.1.0.1.0.0.1

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.1.0.0.1.0.1.0.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146588 A146628 A146636 * A146700 A146708 A146463

Adjacent sequences:  A146830 A146831 A146832 * A146834 A146835 A146836

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 20 21:31 EDT 2021. Contains 348119 sequences. (Running on oeis4.)