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A146744
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.
0
1, 1, 1, 1, 17, 29, 123, 759, 4287, 32985, 430679, 4420973, 81497997, 1458257461, 41635242773
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.1.1.1.1
.1.1.1.1.0.1.1.1
.0.0.0.0.0.0.0.0
.1.1.1.0.1.1.1.1
.1.1.1.1.0.1.1.1
.0.0.0.0.0.0.0.0
.1.1.1.0.1.1.1.1
.1.1.1.1.0.1.1.1
CROSSREFS
Sequence in context: A076727 A347530 A146870 * A103304 A104067 A274023
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved