
LINKS

Table of n, a(n) for n=1..7.
C. Bachoc and P. Gaborit, On extremal additive F_4 codes of length 10 to 18, in International Workshop on Coding and Cryptography (Paris, 2001), Electron. Notes Discrete Math. 6 (2001), 10 pp.
A. R. Calderbank, E. M. Rains, P. W. Shor and N. J. A. Sloane, Quantum error correction via codes over GF(4), arXiv:quantph/9608006, 19961997; IEEE Trans. Inform. Theory, 44 (1998), 13691387.
P. Gaborit, W. C. Huffman, J.L. Kim and V. S. Pless, On additive GF(4) codes, in Codes and Association Schemes (Piscataway, NJ, 1999), A. Barg and S. Litsyn, eds., Amer. Math. Soc., Providence, RI, 2001, pp. 135149.
G. Hoehn, Selfdual codes over the Kleinian fourgroup, Math. Ann. 327 (2003), 227255.
W. C. Huffman, On the classification and enumeration of selfdual codes, Finite Fields Applic., 11 (2005), 451490.
W. C. Huffman, Additive selfdual codes over F_4 with an automorphism of odd prime order, Adv. Math. Commun., 1 (2007), 357398.
G. Nebe, E. M. Rains and N. J. A. Sloane, SelfDual Codes and Invariant Theory, Springer, Berlin, 2006.
E. M. Rains and N. J. A. Sloane, Selfdual codes, pp. 177294 of Handbook of Coding Theory, Elsevier, 1998 (Abstract, pdf, ps).
