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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

The generating function is the solution of a Fuchsian ODE of order 14.

LINKS

Table of n, a(n) for n=3..22.

CROSSREFS

Sequence in context: A097165 A152268 A026002 * A057009 A140480 A327055

Adjacent sequences:  A173406 A173407 A173408 * A173410 A173411 A173412

KEYWORD

nonn

AUTHOR

Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010

STATUS

approved

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Last modified December 4 21:58 EST 2020. Contains 338941 sequences. (Running on oeis4.)