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A146021
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
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0
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1, 1, 1, 1, 1, 3, 17, 33, 77, 271, 971, 3963, 20443, 99229, 615963, 4003277, 33415251, 283218519, 3003051651, 32410844251, 438884364075
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OFFSET
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1,6
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.0.0.0.1.1.1.1
.1.0.0.0.1.0.0.0
.1.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.1
.0.0.0.1.0.0.0.1
.1.1.1.1.0.0.0.1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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