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A191966
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Number of n X n symmetric (0,1) matrices that achieve the record mentioned in A191965.
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6
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1, 1, 1, 12, 15, 900, 6615, 90720, 1995840, 1360800, 197920800, 359251200, 1297296000, 7264857600, 119870150400, 2615348736000, 29640619008000, 533531142144000, 101370917007360000, 101370917007360000, 425757851430912000, 3325168819675422720000
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OFFSET
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1,4
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COMMENTS
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LINKS
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PROG
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(Sage) a191966 = lambda n: sum( factorial(n) // g.automorphism_group(return_group=False, order=True) for g in graphs.nauty_geng(options=f'-c -f {n} {oeis(6855)(n)}:0') ) # Max Alekseyev, Jan 29 2022
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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