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A146404 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 5, 25, 63, 357, 1891, 12499, 113287, 1385821, 19264611, 381162993, 8433132619 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.0.1.0
.0.0.0.1.0.0.1.1
.0.0.0.1.1.0.1.0
.0.0.0.1.0.1.1.0
.0.1.1.0.1.0.0.0
.0.1.0.1.1.0.0.0
.1.1.0.0.1.0.0.0
.0.1.0.0.1.1.0.0
CROSSREFS
Sequence in context: A080856 A060820 A182211 * A323187 A179131 A054994
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)