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Search: id:A086875
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| A086875 |
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Sum of rank(M) over all n X n matrices over Z with all entries zero or one. |
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+0
2
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OFFSET
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1,2
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COMMENT
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The unlikely-looking symbol "+:=" in the MAGMA code is in fact correct. - N. J. A. Sloane (njas(AT)research.att.com), Feb 02 2009
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PROGRAM
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(MAGMA) for a in [1..5] do b := 0; for c in CartesianPower([0, 1], a^2) do b +:= Rank(Matrix(a, a, [aa : aa in c])); end for; print b; end for;
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CROSSREFS
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Sequence in context: A012183 A012230 A086098 this_sequence A012211 A036059 A036519
Adjacent sequences: A086872 A086873 A086874 this_sequence A086876 A086877 A086878
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KEYWORD
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hard,more,nonn
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AUTHOR
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Tom Womack (tom(AT)womack.net), Aug 21 2003
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