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A147356
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 9, 20, 53, 182, 863, 4532, 25697, 176361, 1505241, 14929100
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
.1.0.0.1.1.0.0.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.0.0.1.1.0.0.1
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A191527 A226106 A026566 * A147416 A078841 A147387
KEYWORD
nonn
AUTHOR
STATUS
approved