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A147463
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0011 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 9, 19, 45, 171, 795, 4151, 23359, 160489, 1338097, 13206661, 152301919, 2072243263, 33494417573, 640878789973, 14468834259627, 385605211468773, 12154715457880649, 453340950276092835
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.1.1
.0.0.0.0.0.1.1.0
.0.0.0.0.0.1.1.0
.0.0.0.1.1.0.0.0
.0.1.1.1.1.0.0.0
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A329145 A348377 A147334 * A095828 A028377 A147439
KEYWORD
nonn
AUTHOR
STATUS
approved