1,2

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

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

Sequence in context: A238752 A059586 A160968 * A111491 A163499 A086218

Adjacent sequences: A086829 A086830 A086831 * A086833 A086834 A086835

nonn

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

approved