%I #7 Mar 30 2012 17:37:01
%S 4,12,144,2880,57600,1451520,40642560,1316044800,47377612800,
%T 1900678348800,83629847347200,4017175658496000,208893134241792000,
%U 11700158011224883200,702009480673492992000
%N Number of reversible strings with n labeled beads of 4 colors, no palindromes of more than 1 bead.
%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
%F "BHJ" (reversible, identity, labeled) transform of 4, 0, 0, 0...
%F n! * A032087.
%K nonn
%O 1,1
%A _Christian G. Bower_