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A146938 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 3, 13, 7, 38, 14, 126, 39, 447, 110, 1805, 377, 8300, 1728, 44775, 8445, 290627, 46261, 2170182 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.0.0.1.1.1.1.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A277127 A118275 A243824 * A147418 A146386 A305098

Adjacent sequences:  A146935 A146936 A146937 * A146939 A146940 A146941

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 15 15:14 EDT 2019. Contains 328030 sequences. (Running on oeis4.)