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%I
%S 1,4,15,47,143,412,1157,3170,8534,22631,59295,153768,395297,1008606,
%T 2556663,6443702,16158018,40334613,100277824,248396782,613265776,
%U 1509538293,3705476893,9072944868,22163755695,54026509101,131433905615
%N Number of imperfect staircase polygons by area.
%D A. R. Conway, A. J. Guttmann and M. Delest, The number of three-choice polygons, Mathl. Comput. Modelling, 26 (1997), 51-58.
%D A. J. Guttmann and I. Jensen, Fuchsian differential equation for the perimeter generating function of three-choice polygons, Semi. Lothar. Combin., 54 (2006), B54c (14pp).
%H A. R. Conway, A. J. Guttmann and M. Delest, <a href="http://dx.doi.org/10.1016/S0895-7177(97)00199-4">The number of three-choice polygons</a>, Mathl. Comput. Modelling, 26 (8-10) (1997), 51-58.
%H A. J. Guttmann and I. Jensen, <a href="http://www.emis.de/journals/SLC/wpapers/s54gutjen.html">Fuchsian differential equation for the perimeter generating function of three-choice polygons</a>, Semi. Lothar. Combin., 54 (2006), B54c (14pp).
%K nonn
%O 3,2
%A Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010
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