Permanents and determinants of (0,1) matrices

[Ralf Stephan]

> n=5
> det       times
>   0    21040112

Member of 
%S A046747 1,10,338,42976,21040112,39882864736,292604283435872
%N A046747 n X n rational {0,1}-matrices of determinant 0.
%Y A046747 A046747(n) = 2^(n^2) - n! * binomial(2^n -1, n) + n! * A000410(n). Cf. A000409, A002884.

see also the refs therein.  Sorry if this has been mentioned already.


ralf