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%I #5 Mar 30 2012 16:45:51
%S 0,1,2,2,3,6,6,9,13,15,18,25,27,34,42,47,54,67,72,84
%N Number of ferrites M_4Y_n that repeat after 6n+20 layers.
%D T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).
%K nonn,easy
%O 1,3
%A _N. J. A. Sloane_.
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