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A173409
The number of imperfect staircase polygons counted by diagonal length (also the distance of the terminal vertex from the origin).
0
1, 7, 41, 233, 1357, 8382, 56241, 414991, 3365633, 29693227, 280911761, 2810638235, 29409100985, 319090781677, 3567590180489, 40909656141553, 479411305471567, 5725306905205953, 69520621479362969, 856734086346408633
OFFSET
3,2
COMMENTS
The generating function is the solution of a Fuchsian ODE of order 14.
CROSSREFS
Sequence in context: A097165 A152268 A026002 * A057009 A140480 A327055
KEYWORD
nonn
AUTHOR
Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010
STATUS
approved