A247828 Number of tilings of a 5 X n rectangle using n pentominoes of any shape including exactly one X shape.

0, 0, 0, 1, 8, 76, 734, 7414, 71986, 638499, 5558790, 47971603, 410502410, 3473846885, 29078659564, 241699322196, 1997778940804, 16429720592636, 134489816829048, 1096404231410945, 8906880161717904, 72131791267258552, 582512418898356698, 4692186192041626600

Offset

0,5

Links

Alois P. Heinz, Table of n, a(n) for n = 0..500

Wikipedia, Pentomino

Example

a(3) = 1:
._____.
| ._. |
|_| |_|
|_. ._|
| |_| |
|_____| .

Crossrefs

Column k=1 of A247711.

Sequence in context: A096293 A355049 A239549 * A303736 A083234 A247744

Adjacent sequences: A247825 A247826 A247827 * A247829 A247830 A247831

Keyword

nonn

Author

Alois P. Heinz, Sep 24 2014

Status

approved