[seqfan] Change A186750 to start off 0, -3, 6?

Alonso Del Arte alonso.delarte at gmail.com
Fri Apr 8 20:10:02 CEST 2016


Should we change  A186750 to start off 0, -3, 6 instead  of 3, 6? This
would be to bring it in line with A072191, a(n) = a(n-1)^2 + 2, redefining
A186750 as a(n) = a(n-1)^2 - 3.

Pro: Adding the initial 0 allows this sequence to come up in searches that
currently result in no matches. The Mathematica can be simplified to
NestList[#^2
- 3 &, 0, 9].

Con: It would make this a keyword:sign sequence just for one term. The
sequence starting 3, 6 is part of an array.

Al

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