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A258186 a(n) is the maximal number of circles that can be enclosed by a closed chain of n circles; all circles' centers lie at coordinate points of the planar net 6.6.6. 1
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 6, 6, 7, 7, 10, 10, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,15
COMMENTS
Inspired by A257594, in which the centers of circles can be considered to be placed on coordinate points of the planar net 3.3.3.3.3.3. See illustrations in the links.
LINKS
CROSSREFS
Cf. A257594.
Sequence in context: A358337 A101081 A147795 * A357415 A038716 A168659
KEYWORD
nonn,more
AUTHOR
Kival Ngaokrajang, May 23 2015
STATUS
approved

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)