A011956 - OEIS

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A011956

Barlow packings with group R3m that repeat after 3n layers.

1

1, 2, 4, 10, 21, 42, 84, 164, 322, 620

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

OFFSET

7,2

LINKS

Table of n, a(n) for n=7..16.

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

CROSSREFS

Sequence in context: A175204 A215533 A128461 * A371358 A018003 A328692

Adjacent sequences: A011953 A011954 A011955 * A011957 A011958 A011959

KEYWORD

nonn,easy,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

Name and offset corrected by Andrey Zabolotskiy, Feb 14 2024

STATUS

approved