%I #12 Dec 30 2012 02:00:31
%S 1,420,81496800,6988909668048000,264339188251171547754240000,
%T 4409145118315866486641282521305984000000,
%U 32432910584848683243891703579686352553931989191680000000
%N Pseudo Galois numbers for d=21.
%H Vincenzo Librandi, <a href="/A028683/b028683.txt">Table of n, a(n) for n = 0..27</a>
%F a(n) = d^n * product(d^n - d^k, k=0..n-1).
%t FoldList[ #1*21^#2 (21^#2-1)&, 1, Range[ 20 ] ]
%K nonn
%O 0,2
%A _Olivier GĂ©rard_