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 A086875 Sum of rank(M) over all n X n matrices over Z with all entries zero or one. 2
 1, 21, 1147, 211965, 143331811, 366753209781 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The unlikely-looking symbol "+:=" in the MAGMA code is in fact correct. - N. J. A. Sloane, Feb 02 2009 LINKS Table of n, a(n) for n=1..6. FORMULA a(n) = Sum_{k=1..n} k * A064230(n,k). - Alois P. Heinz, Jun 18 2022 PROG (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; CROSSREFS Cf. A064230. Sequence in context: A357314 A270505 A086098 * A012211 A297071 A036059 Adjacent sequences: A086872 A086873 A086874 * A086876 A086877 A086878 KEYWORD hard,more,nonn AUTHOR Tom Womack (tom(AT)womack.net), Aug 21 2003 EXTENSIONS a(6) from Alois P. Heinz, Jun 18 2022 STATUS approved

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Last modified April 21 12:56 EDT 2024. Contains 371870 sequences. (Running on oeis4.)