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A146235
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-001 pattern in any orientation.
0
1, 1, 1, 1, 5, 17, 37, 167, 1407, 11143, 90213, 1212859, 22145521, 452553163, 11809473343, 424547990571, 19424907241691, 1100794820702881, 80980732651220757, 7763187679043412101, 948623501056895583231
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.1.1.0
.0.0.1.1.0.0.1.1
.1.1.0.1.1.0.1.1
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.1.0.0.1.1.0.1.1
.1.1.1.0.1.1.0.0
.0.1.1.0.1.1.0.0
CROSSREFS
Sequence in context: A147181 A146850 A146428 * A087728 A072332 A212968
KEYWORD
nonn
AUTHOR
STATUS
approved