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A146858
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 17, 43, 153, 711, 4787, 36997, 323223, 3456487, 47029493, 778875019, 15666901145, 390119856899, 11978383979491, 447614381910255, 20341843546977767
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.1.1.0.0
.0.0.1.1.1.0.0.0
.1.1.0.0.1.0.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.0.0.1.0.0.1.1
.0.0.0.1.1.1.0.0
.0.0.1.1.0.1.0.0
CROSSREFS
Sequence in context: A046916 A089527 A146778 * A146183 A163424 A294102
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved