%I #6 May 19 2012 10:14:13
%S 4,1,2,3,4,1,2,4,3,1,2,4
%N A finite sequence (of length 12) in which every permutation of [1..4] is a substring.
%D Adleman, Leonard. Short permutation strings. Discrete Math. 10(1974), 197--200. MR0373911 (51 #10111)
%Y Cf. A212498.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, May 19 2012