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A162034
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Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all main diagonal and antidiagonal elements zero
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1
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1, 1, 2, 3, 10, 23, 161, 643, 10399, 76674, 2793020, 39088170, 3075920130, 83293952237, 13726688369636, 728989553713898, 246651220048842038, 25910326192430212792, 17788328684183351444219, 3714881265827493365084899
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OFFSET
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1,3
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LINKS
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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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