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%I #21 Sep 08 2022 08:44:32
%S 1,336,5630688,4635182361600,187035198320488089600,
%T 369826556020831611935738265600,
%U 35832085525362833262818017603275320524800,170115000551935077294273059250893063598899496222720000
%N Order of universal Chevalley group A_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., Springer-Verlag, NY, reprinted 1984, p. 131.
%F Numbers so far appear to equal A053293(n)/6. - _Ralf Stephan_, Mar 30 2004
%F a(n) = A(7,n) where A(q,n) is defined in A003787. - _Sean A. Irvine_, Sep 18 2015
%t f[m_, n_] := m^(n (n + 1)/2) Product[m^k - 1, {k, 2, n + 1}]; f[7, #] & /@ Range[0, 7] (* _Michael De Vlieger_, Sep 18 2015 *)
%o (Magma) [&*[(7^n - 7^k): k in [0..n-1]]/6: n in [1..10]]; // _Vincenzo Librandi_, Sep 19 2015
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_
%E a(7) from _Sean A. Irvine_, Sep 18 2015
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