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LINKS
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Table of n, a(n) for n=0..9.
Y. Cheng and N. J. A. Sloane, The Automorphism Group of an [18,9,8] Quaternary Code, Discrete Math. 83 (1990), 205-212.
N. Heninger, E. M. Rains and N. J. A. Sloane, On the Integrality of n-th Roots of Generating Functions, arXiv:math/0509316 [math.NT], 2005-2006; J. Combinatorial Theory, Series A, 113 (2006), 1732-1745.
F. J. MacWilliams, A. M. Odlyzko, N. J. A. Sloane and H. N. Ward, Self-Dual Codes over GF(4), J. Combin. Theory, A 25 288-318 1978.
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