[seqfan] Re: Staircase Polygons (with a Rotated Staircase hole) by perimeter

N. J. A. Sloane njas at research.att.com
Sat Feb 14 17:48:59 CET 2009

Olivier,  thanks very much for doing that one sequence, and for your reply. You said:

> I am proposing to look at all missing sequences and gfs in :
> http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.4606v1.pdf
> which complements and extend
 > Exact generating function for 2-convex polygons
> <http://stacks.iop.org/JPhysA/41/055001> arXiv:0805.1259.
> <http://xxx.arxiv.org/abs/0805.1259>
> W. R. G. James, I. Jensen and A. J. Guttmann, J. Phys. A: Math. Theor.
> *41*055001 (2008) (26pp)
> Is that ok or already undertaken by someone ?

That is fine, thanks!

> If you have recommendations on the way we link to Jensen's pages,
> I will be happy to follow them.

I edited your submission slighly, to show
what I think is a good way to handle the links and the credits:
This will be in the OEIS at the next update. (I'm using a recycled A-number)

%I A073913 
%S A073913 1,12,94,604,3461,18412,93016,452500,2139230,9890404,44921002,
%T A073913 201099320,889594210,3896177956,16920602244,72954802376,312595497011,
%U A073913 1332153819572,5650155211024,23864065957572,100418115489408
%N A073913 Number of staircase polygons of perimeter 2n with one (possibly rotated) staircase polygonal hole on the square lattice.
%C A073913 The old entry with this A-number was a duplicate of A070844.
%H A073913 Iwan Jensen, <a href="http://www.research.att.com/~njas/sequences/b073913.txt">Table\
 of n, a(n) for n = 0..117</a> [Data from web page]]
%H A073913 Iwan Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/Polygons_ser.html"\
>Polygon enumerations.</a>
%Y A073913 Cf. A057410, A057414.
%O A073913 0,2
%K A073913 nonn,new
%A A073913 Olivier Gerard, Feb 14 2009, based on data from the web site of Iwan Jensen.

and I formatted the b-file in the standard manner:

0 1
1 12
2 94
3 604
4 3461
5 18412
6 93016
7 452500
8 2139230
9 9890404


Best regards


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