[seqfan] Puzzle sequence A288573

[Neil Sloane]

I just created A288573 for a sequence whose definition is not clear to me.

Someone was asking me why I never post anything to the OEIS page on
Facebook, so as an experiment I just posted a more detailed version of this
question there.

The Kashihara booklet where I found this sequence has a lot of other
sequences that may or may not be in the OEIS.
You can see the booklet in A288573.