A011960 Number of ferrites M_2Y_n that repeat after 6n+10 layers.

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

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