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A finite sequence (of length 12) in which every permutation of [1..4] is a substring.
1

%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