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A194659 A104272(n) - A194658(n). 7
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 12, 0, 0, 0, 0, 36, 32, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30, 0, 0, 0, 0, 18, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30, 0, 0, 0, 0, 0, 0, 0, 0, 0, 44, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

COMMENTS

Conjecture 1. The sequence is unbounded.

Records are 0, 18, 36, 48, ... with indices 1, 13, 19,  43, ... .

The places of nonzero terms correspond to places of those terms of A194658

which are in A164288. Moreover, for n>=1, places of nonzero terms of A194659 and A194186(n+1) coincide. This means that these sequences have the same lengths of the series of zeros.

Conjecture 2. The asymptotic density of nonzero terms is 2/(e^2+1).

LINKS

Table of n, a(n) for n=1..117.

CROSSREFS

Cf. A104272, A194658, A194186, A164288

Sequence in context: A195926 A195929 A247604 * A194186 A033668 A030239

Adjacent sequences:  A194656 A194657 A194658 * A194660 A194661 A194662

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Sep 01 2011

STATUS

approved

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Last modified August 28 18:07 EDT 2015. Contains 261154 sequences.