[seqfan] Re: New plane filling sequences

[Kevin Ryde]

bradklee at gmail.com (Brad Klee) writes:
>
> prove / disprove that A003230 is also related to a sequence counting
> triple points?

In case it helps, enclosed area A003230 is also the number of
double-visited points in that expansion level.

(Area=Doubles for any curve where each enclosed unit square has all 4
sides traversed, since a segment going to an existing point makes a
double and encloses a unit square.)