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A146866
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 9, 25, 67, 375, 1415, 11011, 122823, 1158135, 14699219, 232067021, 4207284521, 106772232239, 3295265497287, 118967291277627, 5362038267435757, 294471642312195023, 20044933173937086949
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.0.0.1.0.1.1.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A147392 A147318 A146589 * A271731 A126363 A036836
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved