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A147172 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 501, 501, 9129, 9129, 252307, 252307, 4894765, 4894765 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.1.0.0.0
.1.1.1.1.0.1.1.1.1
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
CROSSREFS
Sequence in context: A146604 A294691 A356839 * A146825 A147029 A146258
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified April 22 21:44 EDT 2024. Contains 371906 sequences. (Running on oeis4.)