%I #9 Sep 08 2022 08:45:11
%S 1,21,1147,211965,143331811,366753209781
%N Sum of rank(M) over all n X n matrices over Z with all entries zero or one.
%C The unlikelylooking symbol "+:=" in the MAGMA code is in fact correct.  _N. J. A. Sloane_, Feb 02 2009
%F a(n) = Sum_{k=1..n} k * A064230(n,k).  _Alois P. Heinz_, Jun 18 2022
%o (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;
%Y Cf. A064230.
%K hard,more,nonn
%O 1,2
%A Tom Womack (tom(AT)womack.net), Aug 21 2003
%E a(6) from _Alois P. Heinz_, Jun 18 2022
