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A146379 Number of n X n binary arrays symmetric 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, 3, 13, 25, 41, 95, 289, 1010, 4113, 15296, 63783, 305771, 1708813, 10377230, 69118879, 490255119, 4001984029, 36100718210, 369478821921, 4060660472495, 50042558173907 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.0.0.1.0

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.0.1.0.0.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A144826 A030552 A146371 * A056714 A120074 A056706

Adjacent sequences:  A146376 A146377 A146378 * A146380 A146381 A146382

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 20 20:24 EDT 2019. Contains 328273 sequences. (Running on oeis4.)