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A147344 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 15, 29, 45, 73, 153, 491, 1439, 4619, 16351, 52019, 195927, 800019, 3525897, 17183583, 88313479 (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

.0.0.1.0.0.0.1.0.0

.0.0.1.0.1.1.1.0.0

.1.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0.0

.0.1.0.0.0.0.0.1.0

.0.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1.1

.0.0.1.1.1.0.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A242571 A067144 A018784 * A201434 A308385 A202506

Adjacent sequences: A147341 A147342 A147343 * A147345 A147346 A147347

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 3 15:08 EST 2022. Contains 358534 sequences. (Running on oeis4.)