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%I #9 Aug 28 2017 06:29:38
%S 1,12,94,604,3461,18412,93016,452500,2139230,9890404,44921002,
%T 201099320,889594210,3896177956,16920602244,72954802376,312595497011,
%U 1332153819572,5650155211024,23864065957572,100418115489408
%N Number of staircase polygons on the square lattice with perimeter 2n and one (possibly rotated) staircase polygonal hole.
%C The old entry with this A-number was a duplicate of A070844.
%H Iwan Jensen, <a href="/A073913/b073913.txt">Table of n, a(n) for n = 0..117</a> [Data from web page]]
%H Iwan Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/Polygons_ser.html">Polygon enumerations.</a>
%H Iwan Jensen, Andrew Rechnitzer, <a href="http://dx.doi.org/10.1088/1751-8113/41/21/215002">The exact perimeter generating function for a model of punctured staircase polygons</a>, J. Phys. A: Math. Theor. 41 (2008) 215002, Table 1.
%Y Cf. A057410, A057414.
%K nonn
%O 0,2
%A _Olivier Gérard_, Feb 14 2009, based on data from the web site of Iwan Jensen.
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