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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
OFFSET
7,2
CROSSREFS
Cf. A011768.
Sequence in context: A175204 A215533 A128461 * A371358 A018003 A328692
KEYWORD
nonn,easy,more
EXTENSIONS
Name and offset corrected by Andrey Zabolotskiy, Feb 14 2024
STATUS
approved