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A146252 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-011 pattern in any orientation. 0
1, 1, 3, 1, 5, 5, 15, 23, 69, 89, 411, 639, 3479, 7047, 38787, 94093, 630975, 1734343, 14199053, 45390687, 435447535, 1674184531, 18586794693, 84450110411, 1106569877013, 5872912073625, 91248958842685, 569613725750709 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.1
.0.1.1.0.0.1.1.1
.0.1.1.1.0.1.1.0
.0.0.1.1.0.0.0.0
.0.0.0.0.1.1.0.0
.0.1.1.0.1.1.1.0
.1.1.1.0.0.1.1.0
.1.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A205873 A220479 A146913 * A181641 A049266 A089028
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified July 17 18:58 EDT 2024. Contains 374377 sequences. (Running on oeis4.)