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A147031
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 43, 89, 283, 1197, 5015, 19569, 70793, 320835, 1805563, 12416113, 87073927
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.1.1.1.0.0.0.0
.0.1.0.0.1.1.0.0.0
.0.1.0.0.1.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.1.0.0.1.0
.0.0.0.1.1.0.0.1.0
.0.0.0.0.1.1.1.0.0
.0.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A240001 A301685 A102724 * A147220 A269713 A196069
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved