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%I
%S 4,32,3072,2752512,21139292160,1342091380654080,692647993190048071680,
%T 2882479558988139892026900480,96342151992701835341576224427212800,
%U 25811138467998276182105365247324712232550400
%N Order of unitary 2^n X 2^n group H_{n,4} acting on Siegel modular forms.
%D B. Runge, On Siegel modular forms I, J. Reine Angew. Math., 436 (1993), 57-85.
%D B. Runge, Codes and Siegel modular forms, Discrete Math. 148 (1996), 175-204.
%H <a href="/index/Gre#groups_modular">Index entries for sequences related to modular groups</a>
%p seq(2^(n^2+2*n+2)*mul(2^i-1, i=1..n), n=0..10);
%Y Cf. A005329.
%K nonn,nice,easy
%O 0,1
%A _N. J. A. Sloane_
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