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A086832 Number of ways to tile an n X n board having a black border with the following 1 X 1 tiles: bbbb, bbww, wbbw, bwwb, wwbb, where the colors are read clockwise around each tile. 2
1, 2, 5, 36, 324, 7041, 233265, 16038658, 1884307184, 426645198097, 173238487743952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A valid tiling is one in which black touches black and white touches white.

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Sequence in context: A238752 A059586 A160968 * A111491 A163499 A086218

Adjacent sequences:  A086829 A086830 A086831 * A086833 A086834 A086835

KEYWORD

nonn

AUTHOR

Aaron M. Balog (ambalog(AT)ucdavis.edu), Aug 07 2003

STATUS

approved

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Last modified November 25 16:38 EST 2014. Contains 249998 sequences.