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A011953 Number of Barlow packings with group P3m1 that repeat after n layers. +0
1
3, 2, 10, 15, 42, 68, 162, 280, 600, 1088, 2214, 4112, 8154, 15366, 30052, 57208, 111166, 212982, 412890, 794688, 1540002, 2974150, 5767344, 11167872, 21680832, 42073640, 81787057, 159005154, 309503502, 602667098 (list; graph; listen)
OFFSET

9,1
REFERENCES

T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).

CROSSREFS

Sequence in context: A075856 A025520 A099946 this_sequence A038519 A082219 A034461

Adjacent sequences: A011950 A011951 A011952 this_sequence A011954 A011955 A011956

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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