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A002519
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Theta series of 28-dimensional unimodular lattice with no roots and a parity vector of norm 4.
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1
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1, 0, 0, 1728, 106472, 1734912, 19335168, 141575552, 805208040, 3725209088, 14647517184, 50579062848, 156715230240, 443680116992, 1162915024896, 2851005884544, 6596700471272, 14509559545344, 30507866603520
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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REFERENCES
| R. Bacher and B. B. Venkov, Reseaux entiers unimodulaires sans racine en dimension 27 et 28, in Reseaux euclidiens, designs spheriques et formes modulaires, pp. 212-267, Enseignement Math., Geneva, 2001.
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LINKS
| R. Bacher and B. B. Venkov, Reseaux entiers unimodulaires sans racine en dimension 27 et 28 (html, ps).
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FORMULA
| t3^28-56*t3^20*D8+280*t3^12*D8^2-512*t3^4*D8^3 where t3=theta3(z) and D8=(theta2(z)theta4(z))^4/16
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CROSSREFS
| Cf. A002520.
Sequence in context: A202200 A017403 A017523 * A052068 A114767 A165134
Adjacent sequences: A002516 A002517 A002518 * A002520 A002521 A002522
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Jul 04 2000
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