|
|
A086875
|
|
Sum of rank(M) over all n X n matrices over Z with all entries zero or one.
|
|
2
|
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
The unlikely-looking symbol "+:=" in the MAGMA code is in fact correct. - N. J. A. Sloane, Feb 02 2009
|
|
LINKS
|
|
|
FORMULA
|
|
|
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
|
|
|
KEYWORD
|
hard,more,nonn
|
|
AUTHOR
|
Tom Womack (tom(AT)womack.net), Aug 21 2003
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|