A121760/1: two (interesting?) sequences

[Antti Karttunen]

franktaw at netscape.net wrote:

> ...
> People tend to be uninterested in "base" sequences because we are
> interested in the numbers, not in how they happen to be written.  I
> think there are relatively few who are totally uninterested in all "base"
> sequences, but there are a vast number of such sequences in the OEIS,
> and most are really just about writing digits.
> ...
>
Moreover, in many cases, even more interesting than the numbers themselves
are the mathematical structures behind them. Trees, graphs, necklaces,
bracelets, Kepler towers, just to name a few. The sequence itself
is "just a fingerprint" for these, offering a "pointer" to the latest 
research
done on the subject. (The %D-lines).*
*C.f. the first question and its answer in FAQ:
http://www.research.att.com/~njas/sequences/FAQ.html#Z03


Terveisin,

Antti