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A146742
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 7, 15, 27, 47, 131, 579, 2405, 9787, 35829, 162637, 924049, 6701259, 48977223, 381859081, 3048055139, 30000129347
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.1.1.1.1.0.0
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.1.1.0.0.0
CROSSREFS
Sequence in context: A360452 A097080 A274008 * A146425 A147595 A147127
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved