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A146580 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 457, 457, 7575, 7575, 206575, 206575, 7284891, 7284891, 429058537, 429058537, 43146239725, 43146239725 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 9 X 9 example

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

CROSSREFS

Sequence in context: A146572 A147211 A147241 * A146455 A146048 A146809

Adjacent sequences:  A146577 A146578 A146579 * A146581 A146582 A146583

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 2 04:54 EDT 2022. Contains 357191 sequences. (Running on oeis4.)