2,1

a(14) is unknown but conjectured to be 2.

The conjectured sequence is 4, 6, 8, 10, 12, 12, 14, 16, 2, 2, 6, 2, 2, 10, 2, 2, 12, 12, 2...

Table of n, a(n) for n=2..13.

Wikipedia, Circle packing in a circle

Sequence in context: A139203 A179372 A240024 * A061408 A063287 A228358

Adjacent sequences: A227402 A227403 A227404 * A227406 A227407 A227408

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Keenan Pepper, Sep 21 2013

approved