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A146736
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 19, 45, 71, 181, 579, 2359, 9473, 49633, 219719, 1381673, 7390193, 56382323, 390282737, 3729442205, 31973256841
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.1.0.0.1.1.1.0.0
.1.1.1.0.0.1.0.0
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.0.0.1.0.0.1.1.1
.0.0.1.1.1.0.0.1
.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A146616 A146395 A154302 * A176358 A045458 A120289
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved