A173408 The number of staircase polygons with a staircase hole counted by the outer half-perimeter only.

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.

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