[seqfan] Re: A160242
paoloplava at gmail.com
Fri Apr 16 08:01:45 CEST 2010
Ok thanks Richard!
2010/4/15 Richard Mathar <mathar at strw.leidenuniv.nl>
> pl> From seqfan-bounces at list.seqfan.eu Thu Apr 15 11:09:37 2010
> pl> From: Paolo Lava <paoloplava at gmail.com>
> pl> Subject: [seqfan] A160242
> pl> ...
> pl> It could be that the original definition of A160242 (see comment) was
> pl> but I certainly do not understand the present one. It should be like
> pl> with 0 replaced by 2. Or not???
> A160242 can be defined as
> "a(n)=1 if n =0 or n in A002061, otherwise a(n)=2"
> So it is some sort of characteristic function of the central polygonal
> http://oeis.org/classic/A002061 .
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