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A146378 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 16, 5, 66, 13, 195, 31, 1006, 121, 6245, 491, 48466, 3357, 493217, 25639, 5217946, 206564, 68677904, 2153667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.0.0.0

.0.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.1.0.1.0.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.1.0.1.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A289310 A160085 A147024 * A166086 A232101 A176249

Adjacent sequences:  A146375 A146376 A146377 * A146379 A146380 A146381

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 21 16:25 EDT 2019. Contains 328302 sequences. (Running on oeis4.)