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Number of self-dual negacyclic codes of length 2n over GF(9), where 2n runs through the numbers congruent to 2 or 4 mod 6 (cf. A047235).
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%I #10 Nov 24 2015 17:02:54

%S 4,4,8,8,4,64,8,32,64,4,8,8,1024,64,8,32,1024,64,8,8,4,64,512,32,64,

%T 1024,2048,8,64,64,8,32,1024,1024,8,512,64,64,8,8192,64,4,32768,128,

%U 1024,262144,8,8192,1024,64,512,8,1024,4194304,8,8192,64,64,8,2147483648,64,64,512,32,1024,262144

%N Number of self-dual negacyclic codes of length 2n over GF(9), where 2n runs through the numbers congruent to 2 or 4 mod 6 (cf. A047235).

%H Amita Sahni and Poonam Trama Sehgal, <a href="http://dx.doi.org/10.3934/amc.2015.9.437">Enumeration of self-dual and self-orthogonal negacyclic codes over finite fields</a>, Advances in Mathematics of Communications, Volume 9, No. 4, 2015, 437-447.

%Y Cf. A047235, A264605.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Nov 24 2015