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A018803 Number of ways to color cells of n X n square with 2 colors so that no subsquare of side >1 has all corners same color. +0
1
2, 14, 276, 10980, 781712, 58339148, 3066831440 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A156214 A015197 A156910 this_sequence A132695 A015015 A128087

Adjacent sequences: A018800 A018801 A018802 this_sequence A018804 A018805 A018806

KEYWORD

nonn,fini

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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