%I
%S 3,28224,2317591180800,112554991177798901760000,
%T 52386144472825139642572263782154240000,
%U 14630778277213500974314928221817819519899234908241920000
%N Order of (usually) simple Chevalley group D_n (7).
%D J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985, p. xvi.
%D H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., SpringerVerlag, NY, reprinted 1984, p. 131.
%F a(n) = d(7,n) where d(q,n) is defined in A003837.  _Sean A. Irvine_, Sep 17 2015
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_.
