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A146816
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1110-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 19, 31, 717, 1507, 20113, 52053, 1344751, 4220463, 406071927, 1625689575, 292516297827, 1472388906019, 367500695278431, 2286735420596063
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A146784 A147240 A147210 * A146659 A160220 A133151
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved