A034233 - OEIS

%I #11 Aug 09 2020 01:11:33

%S 1,1,2,4,10,13,23,26,32,26,23,13,10,4,2,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,0,0

%N Number of quaternary codes of length 2 with n words.

%H H. Fripertinger, <a href="http://www.mathe2.uni-bayreuth.de/frib/codes/tables.html">Isometry Classes of Codes</a>

%H H. Fripertinger, <a href="https://doi.org/10.1023/A:1008248618779">Enumeration, construction and random generation of block codes</a>, Designs, Codes, Crypt., 14 (1998), 213-219.

%Y Cf. A034188-.

%K nonn

%O 0,3

%A _N. J. A. Sloane_.

%E Missing a(16)=1 inserted by _Sean A. Irvine_, Aug 08 2020