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A147169 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 9, 21, 55, 201, 1193, 6291, 45811, 376085, 4555905 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.1
.0.1.1.0.0.0.0.1
.0.0.1.1.0.0.1.1
.1.1.0.0.1.1.0.0
.1.0.0.0.0.1.1.0
.1.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A347502 A134717 A216980 * A216167 A246327 A320896
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified February 23 08:04 EST 2024. Contains 370269 sequences. (Running on oeis4.)