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A146668 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 253, 253, 3643, 3643, 105629, 105629, 2607651, 2607651, 96901053, 96901053 (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

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.0.1.1.1.0.1.1.1.0

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.0.1.1.1.0.1.1.1.0

.0.0.1.1.0.1.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146777 A147053 A146857 * A146732 A146588 A146628

Adjacent sequences:  A146665 A146666 A146667 * A146669 A146670 A146671

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 23 23:01 EST 2022. Contains 350515 sequences. (Running on oeis4.)