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A147336 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 5, 17, 31, 53, 121, 345, 909 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.0.1.0.0
.0.1.0.0.0.1.1.1.0
.1.1.0.1.1.1.0.0.0
.0.1.1.0.1.0.1.0.0
.0.0.1.1.0.1.1.0.0
.0.0.1.0.1.0.1.1.0
.0.0.0.1.1.1.0.1.1
.0.1.1.1.0.0.0.1.0
.0.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A031013 A031370 A147434 * A128354 A078654 A083364
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)