A173409 The number of imperfect staircase polygons counted by diagonal length (also the distance of the terminal vertex from the origin).

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.

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