%I
%S 1,1,2,5,47,105,1272,8424,55856,388800,6592492,37965600,1573051680,
%T 10106845824,145938179520,2694653982720,18948491739696,
%U 267048208800000,23293245955795200,466687809894297600,3372079713556377600
%N Maximum absolute value of coefficients of characteristic polynomial of M_n, the n X n matrix m_(i,j) = i mod j.
%e Characteristic polynomial of M_4 is x^4  5*x^2  2*x^1 + 0*x^0.
%t a[n_] := Max@@Abs/@CoefficientList[CharacteristicPolynomial[Table[Mod[i, j], {i, n}, {j, n}], x], x]
%Y Cf. A078924.
%K nonn
%O 1,3
%A _Benoit Cloitre_, Dec 15 2002
