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A146725
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 3, 13, 35, 157, 741, 4435, 44453, 490313, 6256041, 104651895, 2130039209, 56493398929, 1931237117101, 81069750246845, 4246906418006015, 279802247495802441
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.1.0.0.0
.1.1.1.0.1.0.1.1
.1.0.1.1.0.0.1.0
.0.0.0.0.0.0.1.1
.0.0.0.1.1.1.0.1
.0.0.0.1.0.1.1.0
CROSSREFS
Sequence in context: A108480 A322187 A146741 * A146424 A146049 A061483
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved