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A146036 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0
1, 1, 1, 1, 1, 1, 11, 17, 43, 77, 281, 645, 3017, 9213, 61533, 218977, 1561879, 6900617, 60762405, 333893691, 3718652761, 25349082469, 352708796463, 2947039725027 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.0.0

.0.1.0.0.0.1.1.1

.0.1.1.1.0.1.0.0

.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0

.0.0.1.0.1.1.1.0

.1.1.1.0.0.0.1.0

.0.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A187060 A190800 A191456 * A248482 A267772 A046122

Adjacent sequences:  A146033 A146034 A146035 * A146037 A146038 A146039

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified September 25 10:18 EDT 2020. Contains 337337 sequences. (Running on oeis4.)