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A146044
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
0
1, 1, 1, 1, 1, 7, 15, 37, 79, 277, 1211, 6171, 28503, 152765, 945077, 7764777, 66517839, 667569119, 7061433273, 91063498499, 1300158727279, 22513920414055
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.0
.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A159792 A247606 A146837 * A048694 A041094 A042287
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved