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A147154 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 9, 33, 125, 685, 3853, 28603, 231163, 2799935, 41066873, 767865147, 16399923305 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.0.1.0
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.0.1.0.0.1.1.0.0
.0.0.1.1.0.0.1.0
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.0.1.0.0.1.1.0.0
CROSSREFS
Sequence in context: A146180 A221447 A147147 * A257284 A257744 A147275
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified July 18 06:23 EDT 2024. Contains 374377 sequences. (Running on oeis4.)