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A011949
Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.
1
1, 2, 6, 12, 28, 56, 119, 240, 496, 990, 2016, 4032, 8121, 16256, 32640, 65268, 130816, 261630, 523747, 1047552, 2096128, 4192200, 8386554
OFFSET
3,2
REFERENCES
T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).
CROSSREFS
Sequence in context: A222970 A112510 A284449 * A350271 A089820 A122746
KEYWORD
nonn,easy
AUTHOR
STATUS
approved