%I A005020 M2182
%S A005020 1,2,168,32738,20825760,47942081642
%N A005020 (0,1)-matrices by 1-width.
%D A005020 Lam, Clement W. H. The distribution of $1$-widths of $(0, 1)$-matrices. 
               Discrete Math. 20 (1977/78), no. 2, 109-122.
%D A005020 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A005020 <a href="Sindx_Mat.html#binmat">Index entries for sequences related to 
               binary matrices</a>
%Y A005020 Sequence in context: A162904 A139928 A142602 this_sequence A157316 A163970 
               A007760
%Y A005020 Adjacent sequences: A005017 A005018 A005019 this_sequence A005021 A005022 
               A005023
%K A005020 nonn
%O A005020 1,2
%A A005020 N. J. A. Sloane (njas(AT)research.att.com).