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A146279 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation. 0
1, 1, 1, 1, 3, 13, 51, 211, 749, 2651, 19761, 133713, 1247055, 13243557, 208954265, 3004516121, 57775455787, 1089272926485, 30671906403639, 864548428805023 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.0.1.1.1.0
.1.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.1
.0.1.1.1.0.0.0.0
.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A360874 A270913 A323266 * A098619 A086608 A291182
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 13 20:16 EDT 2024. Contains 371645 sequences. (Running on oeis4.)