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A146003 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2. 0
1, 1, 2, 1, 2, 1, 7, 6, 19, 15, 82, 92, 528, 627, 4309, 6489, 53016, 91030, 867823, 1786877, 20390977, 49468143, 661574922, 1894696908, 30092058825, 102088443564, 1912895752719, 7656903764168, 169685780823556 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.0.1.1.1.0.0
.0.1.0.0.1.0.0.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.0.0.1.0.0.1.0
.0.0.1.1.1.0.0.0
.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A198316 A011128 A245595 * A334730 A201453 A260897
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)