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A146717
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 17, 39, 155, 745, 4705, 39573, 369483, 3970963, 54943873, 950039207, 20417177215, 545483266919, 17663079620537, 695250063366563, 33778790635375371
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.1.0
.0.0.0.0.1.0.1.0
.1.1.0.0.1.0.1.1
.1.1.1.1.0.1.1.1
.1.0.0.0.1.0.0.0
.0.1.1.1.1.0.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A147165 A147257 A146645 * A147467 A146272 A147035
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved