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A027639 Order of unitary 2^n X 2^n group H_{n,4} acting on Siegel modular forms. 1
4, 32, 3072, 2752512, 21139292160, 1342091380654080, 692647993190048071680, 2882479558988139892026900480, 96342151992701835341576224427212800, 25811138467998276182105365247324712232550400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

B. Runge, On Siegel modular forms I, J. Reine Angew. Math., 436 (1993), 57-85.

B. Runge, Codes and Siegel modular forms, Discrete Math. 148 (1996), 175-204.

LINKS

Table of n, a(n) for n=0..9.

Index entries for sequences related to modular groups

MAPLE

2^(n^2+2*n+2)*product(2^'i'-1, 'i'=1..n);

CROSSREFS

Cf. A027639.

Sequence in context: A257583 A258122 A012092 * A117620 A059904 A145645

Adjacent sequences:  A027636 A027637 A027638 * A027640 A027641 A027642

KEYWORD

nonn,nice,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 24 13:18 EST 2018. Contains 299623 sequences. (Running on oeis4.)