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A146656
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 15, 35, 63, 141, 389, 1325, 3883, 15377, 77717, 402273, 2247249, 12314001, 75093365, 525963699
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.1.0.1
.0.1.0.0.0.1.1.1
.1.1.1.1.0.1.0.0
.0.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.0
.0.0.1.0.1.1.1.1
.1.1.1.0.0.0.1.0
.1.0.1.0.0.0.1.1
CROSSREFS
Sequence in context: A067930 A257836 A146688 * A229108 A160497 A098271
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved