%I A089481
%S A089481 9,0,1,265,0,63,0,9,0,1,27713,0,9360,0,3582,0,1248,0,648,0,288,0,48,0,
%T A089481 72,0,0,0,16,0,0,0,0,0,1,10363361,0,3645600,0,2411250,0,1404800,0,
%U A089481 1043700,0,682200,0,417100,0,336600,0,177750,0,183400,0,85950,0,60000,
               0
%N A089481 Triangle T(n,k) read by rows, where T(n,k) = number of times the permanent 
               of a real singular n X n (0,1)-matrix takes the value k, for n >= 
               2, 0 <= k <= n!.
%C A089481 T(n,n!)=1.
%D A089481 Seok-Zun Song et al., Extremes of permanents of (0,1)-matrices, Linear 
               Algebra and its Applications 373, (2003), pp. 197-210.
%Y A089481 T(n, 0)=A088672(n). The n-th row of the table contains A089476(n) nonzero 
               entries. Cf. A089479 occurrence counts for permanents of all (0, 
               1)-matrices.
%Y A089481 Sequence in context: A118811 A013570 A065471 this_sequence A065421 A093767 
               A107091
%Y A089481 Adjacent sequences: A089478 A089479 A089480 this_sequence A089482 A089483 
               A089484
%K A089481 nonn,tabf
%O A089481 2,1
%A A089481 Hugo Pfoertner (hugo(AT)pfoertner.org), Nov 09 2003