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A147337 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 21, 61, 255, 1001, 4645, 25381, 168687, 1415389 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.1.1.0
.0.0.1.0.1.1.0.0
.0.0.1.1.0.1.0.0
.0.1.1.0.0.0.0.0
.1.1.0.0.0.0.0.0
.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A246327 A320896 A127989 * A020290 A020288 A338007
KEYWORD
nonn,more
AUTHOR
STATUS
approved

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Last modified July 13 21:38 EDT 2024. Contains 374288 sequences. (Running on oeis4.)