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N. Heninger, E. M. Rains and N. J. A. Sloane, <a href="httphttps://arXivdx.doi.org/abs/math10.NT1016/0509316j.jcta.2006.03.018">On the Integrality of n-th Roots of Generating Functions</a>, J. Combinatorial Theory, Series A, 113 (2006), 1732-1745.
N. Heninger, E. M. Rains and N. J. A. Sloane, <a href="https://arxiv.org/abs/math/0509316">On the Integrality of n-th Roots of Generating Functions</a>, arXiv:math/0509316 [math.NT], 2005-2006.
Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/LeechLattice.html">Leech Lattice.</a>
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Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/LeechLattice.html">Leech Lattice.</a>
Cf. A106205.
Seiichi Manyama, <a href="/A108093/b108093.txt">Table of n, a(n) for n = 0..378</a>
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