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A146684 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 265, 265, 2569, 2569, 53981, 53981, 1294213, 1294213, 32947589 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.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

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146716 A146399 A146407 * A146652 A147133 A147164

Adjacent sequences:  A146681 A146682 A146683 * A146685 A146686 A146687

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 16 00:08 EDT 2022. Contains 356150 sequences. (Running on oeis4.)