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A247597
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Number of nonisomorphic binary n X n matrices with four 1's per column under row and column permutations.
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5
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1, 7, 132, 6178, 594203, 85820809, 16341829155, 3875736708590, 1112175913348040, 378860991866916370, 151006214911844288232, 69600017255860985666964, 36729204987785981237238642, 22003003913198378660826731007, 14851323097928973689736994569534
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OFFSET
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4,2
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LINKS
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MAPLE
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seq(matrix_marks(n, 4), n=3..15); # Using the uploaded program to A247417
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PROG
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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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