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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
OFFSET
6,2
COMMENTS
The generating function is the solution to a Fuchsian ODE of order 11.
CROSSREFS
Sequence in context: A222477 A041368 A026882 * A166794 A229386 A208047
KEYWORD
nonn
AUTHOR
Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010
STATUS
approved