A011963 - OEIS

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A011963

Number of ferrites M_8Y_n that repeat after 6n+40 layers.

0

0, 2, 4, 10, 19, 44, 76, 150, 251, 432, 686, 1094, 1646, 2498, 3608, 5206, 7301, 10160, 13814, 18718

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

OFFSET

1,2

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: A295961 A219555 A263738 * A083844 A026554 A394554

Adjacent sequences: A011960 A011961 A011962 * A011964 A011965 A011966

KEYWORD

nonn,easy,more,changed

AUTHOR

N. J. A. Sloane

STATUS

approved