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A146424
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111 pattern in any orientation.
0
1, 1, 1, 1, 3, 13, 35, 165, 727, 4597, 49361, 536263, 7236179, 123419355, 2560850455, 72571417743, 2591027414559, 113550328451315, 6265506511430339, 433231100847867929
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.1.1.0.0.0
.1.0.1.0.1.0.1.1
.1.1.1.1.0.0.0.1
.0.0.0.0.0.0.1.1
.0.0.0.1.0.1.0.1
.0.0.0.1.1.1.1.0
CROSSREFS
Sequence in context: A322187 A146741 A146725 * A146049 A061483 A340410
KEYWORD
nonn
AUTHOR
STATUS
approved