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A001646 Number of self-dual codes of length 2n over GF(4). 0
1, 1, 1, 2, 3, 5, 10, 21, 55 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..8.

J. Conway, V. Pless, N. Sloane, Self-dual codes over GF(3) and GF(4)of length not exceeding 16, IEEE Trans. Information Theory 25 312-322 1979.

W. C. Huffman, On the classification and enumeration of self-dual codes, Finite Fields Applic. 11 (2005), 451-490.

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.

G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.

E. M. Rains and N. J. A. Sloane, Self-dual codes, pp. 177-294 of Handbook of Coding Theory, Elsevier, 1998 (Abstract, pdf, ps).

CROSSREFS

Sequence in context: A002991 A218532 A022861 * A103595 A293842 A014844

Adjacent sequences:  A001643 A001644 A001645 * A001647 A001648 A001649

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)