[seqfan] Re: Staircase Polygons (with a Rotate...), a correction

[N. J. A. Sloane]

After reading the definition again, I see that the order
of words should be changed slightly.  Here is a better version:

%N A073913 Number of staircase polygons on the square lattice with perimeter 2n and one (possib\
ly rotated) staircase polygonal hole.

Neil