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A173408 The number of staircase polygons with a staircase hole counted by the outer half-perimeter only. 0
1, 14, 127, 958, 6601, 43698, 287507, 1929706, 13486531, 99571340, 782211324, 6539607380, 57901173453, 538952965192, 5234230025617, 52686138293574, 546666444601661, 5821956732601772, 63426558436432195, 704956833621381378 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

COMMENTS

The generating function is the solution to a Fuchsian ODE of order 11.

LINKS

Table of n, a(n) for n=6..25.

CROSSREFS

Sequence in context: A222477 A041368 A026882 * A166794 A229386 A208047

Adjacent sequences:  A173405 A173406 A173407 * A173409 A173410 A173411

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified August 12 13:59 EDT 2022. Contains 356077 sequences. (Running on oeis4.)