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A146731
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1110-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 17, 31, 603, 1111, 11835, 31735, 783013, 2381907, 261886119, 1041960181, 168146324241, 823285902521, 171094649806295, 1035545079698547, 471550435880949163, 3533719074119018679
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
CROSSREFS
Sequence in context: A060342 A045700 A146800 * A146667 A146462 A089171
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved