%I #9 Aug 09 2020 01:08:36
%S 1,1,4,20,223,3227,77194,2097080,57796870,1502295684,36065804158,
%T 795109767172,16115614918786,301341514055753,5220182848555434,
%U 84132279974374399
%N Number of quaternary codes of length 4 with n words.
%H Sean A. Irvine, <a href="/A034235/b034235.txt">Table of n, a(n) for n = 0..256</a>
%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,fini,full
%O 0,3
%A _N. J. A. Sloane_.