[seqfan] Re: A160242

[Richard Mathar]

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 right
pl> but I certainly do not understand the present one. It should be like A010052
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 numbers
http://oeis.org/classic/A002061 .

RJM