

A118991


Number of real n X n symmetric (0,1) matrices with nonzero permanent.


2




OFFSET

1,2


LINKS



FORMULA



CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS

Max Alekseyev's formula corrected (the term 2^(n^2), counting the total number of binary matrices, has been substituted for 2*2^2*...*2^n = 2^(n(n+1)/2), the total number of binary symmetric matrices) by Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 26 2010


STATUS

approved



