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A147049 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 21, 25, 57, 73, 453, 801, 5305, 11153, 83189 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.0.0.0
.0.0.0.0.0.1.1.0.0
.0.1.0.1.1.1.0.0.0
.1.1.1.0.1.0.1.0.0
.0.0.1.1.0.1.1.0.0
.0.0.1.0.1.0.1.1.1
.0.0.0.1.1.1.0.1.0
.0.0.1.1.0.0.0.0.0
.0.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A324551 A338081 A118568 * A219393 A020269 A031170
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)