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A002520
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Theta series of 28-dimensional unimodular lattice with no roots and with no parity vector of norm 4.
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2
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1, 0, 0, 2240, 98280, 1790208, 19138560, 141920640, 805208040, 3723722240, 14651449344, 50573436480, 156717687840, 443691198720, 1162883174400, 2851049534592, 6596666916840, 14509544394240, 30507984568320
(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 where t3=theta_3(z) and D8=(theta_2(z)*theta_4(z))^4/16.
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CROSSREFS
| Cf. A002519.
Sequence in context: A079013 A186865 A038728 * A183771 A107529 A125522
Adjacent sequences: A002517 A002518 A002519 * A002521 A002522 A002523
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KEYWORD
| nonn,nice,easy
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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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