OEIS in Wikipedia

[N. J. A. Sloane]

> There *is* however 
> <http://www.research.att.com/~njas/sequences//~njas/sequences/A056755>A056755 
> which is currently uniquely both nice and obscure.

Well, the pictures /are/ nice, and the sequence interests me a lot

on the other hand i have not been able to get a clear definition for it.

so the keywords are appropriate.  it would be nice
if someone could provide a precise definition

Neil