%I
%S 1,7,41,233,1357,8382,56241,414991,3365633,29693227,280911761,
%T 2810638235,29409100985,319090781677,3567590180489,40909656141553,
%U 479411305471567,5725306905205953,69520621479362969,856734086346408633
%N The number of imperfect staircase polygons counted by diagonal length (also the distance of the terminal vertex from the origin).
%C The generating function is the solution of a Fuchsian ODE of order 14.
%K nonn
%O 3,2
%A Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010
