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A146907
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
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0
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1, 1, 1, 3, 1, 3, 1, 5, 7, 23, 21, 73, 67, 331, 379, 2159, 3073, 18347, 29787, 200555, 362821, 2889871, 5926103, 54516713, 129199873, 1351622999, 3735869433, 44518336027, 139642079573, 1907609753527
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OFFSET
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1,4
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
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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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