A011960 - OEIS

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A011960

Number of ferrites M_2Y_n that repeat after 6n+10 layers.

0

0, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 3, 2, 3, 3, 3, 3, 4, 3, 4

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

T. J. McLarnan, The numbers of polytypes in close-packings and related structures, Zeits. Krist. 155, 269-291 (1981)

CROSSREFS

Sequence in context: A078704 A306468 A032358 * A187035 A008615 A103221

Adjacent sequences: A011957 A011958 A011959 * A011961 A011962 A011963

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

STATUS

approved