A176068 Number of inequivalent indecomposable Hermitian self-dual codes over GF(4) of length 2n with minimum weight 4.

1, 1, 2, 4, 9, 27, 152, 2163

Offset

3,3

Comments

From Table 1: Hermitian self-dual codes of Harada & Munemasa.

Links

Table of n, a(n) for n=3..10.

Masaaki Harada and Akihiro Munemasa, Classification of quaternary Hermitian self-dual codes of length 20, IEEE Transactions on Information Theory, 57 (2011), 3758-3762; also on arXiv, arXiv:1012.0898 [math.CO], 2010.

Example

a(3) = 1 because there is a unique Hermitian self-dual code of length 6=2*3 with minimum weight 4.
a(10) = 2163 because there are 2163 inequivalent Hermitian self-dual code of length 20=2*10 with minimum weight 4, a result new to Harada.

Crossrefs

Cf. A001646.

Sequence in context: A343845 A349404 A332979 * A296264 A343166 A219665

Adjacent sequences: A176065 A176066 A176067 * A176069 A176070 A176071

Keyword

nonn,more

Author

Jonathan Vos Post, Dec 06 2010

Extensions

Name corrected by Andrey Zabolotskiy, Sep 13 2021

Status

approved