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A011961
Number of ferrites M_4Y_n that repeat after 6n+20 layers.
0
0, 1, 2, 2, 3, 6, 6, 9, 13, 15, 18, 25, 27, 34, 42, 47, 54, 67, 72, 84
OFFSET
1,3
REFERENCES
T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).
CROSSREFS
Sequence in context: A035560 A077012 A078921 * A182713 A229626 A358088
KEYWORD
nonn,easy
AUTHOR
STATUS
approved