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A146258 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 609, 609, 23953, 23953, 643873, 643873, 12050113, 12050113, 545308145, 545308145 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
CROSSREFS
Sequence in context: A147172 A146825 A147029 * A146173 A146190 A147125
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)