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A147057 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 15, 43, 67, 135, 405, 1643, 5861, 31427, 120095, 674029, 3441725, 24151139, 153308175, 1325530085 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.1.0

.1.0.1.1.0.1.0.0

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.0.0.1.0.1.1.0.1

.0.1.1.0.0.1.0.0

CROSSREFS

Sequence in context: A192060 A316642 A146805 * A330322 A101165 A127407

Adjacent sequences:  A147054 A147055 A147056 * A147058 A147059 A147060

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 29 21:05 EDT 2022. Contains 354913 sequences. (Running on oeis4.)