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A146425
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 7, 15, 27, 47, 145, 629, 2639, 10689, 40727, 200517, 1226295, 9011761, 67694903, 542738577, 4721537297, 50165476303, 597630948157
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.1.0.0
.0.0.1.1.1.1.0.0
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A097080 A274008 A146742 * A147595 A147127 A146726
KEYWORD
nonn
AUTHOR
STATUS
approved