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A147471
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 3, 9, 15, 33, 57, 163, 337, 1301, 3059, 12941, 34215, 171133, 573633, 3343793, 12826849, 85459189, 371588907, 2938061259, 15238544087, 143663828309
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.0.1.1
.0.0.1.0.1.1.1.1
.1.1.1.1.0.0.1.0
.0.0.1.1.0.0.1.0
.0.1.0.0.1.1.0.0
.0.1.0.0.1.1.1.1
.1.1.1.1.0.1.0.0
.1.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A223209 A233026 A105423 * A062510 A000200 A100744
KEYWORD
nonn
AUTHOR
STATUS
approved