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A146596

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 77, 77, 549, 549, 6061, 6061, 126381, 126381, 3867721, 3867721, 164716773, 164716773

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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

.1.0.0.0.0.0.0.0.1

.1.1.1.1.0.1.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.1.1.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146817 A146660 A070852 * A146391 A145945 A165838

Adjacent sequences: A146593 A146594 A146595 * A146597 A146598 A146599

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

URL: https://oeis.org/A146596

⇱ A146596 - OEIS