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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. 1
1, 2, 14, 276, 10980, 781712, 58339148, 3066831440 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

CROSSREFS

Main diagonal of A255256.

Sequence in context: A015197 A156910 A279117 * A217474 A132695 A015015

Adjacent sequences:  A018800 A018801 A018802 * A018804 A018805 A018806

KEYWORD

nonn,fini

AUTHOR

David W. Wilson

EXTENSIONS

a(0)=1 from Alois P. Heinz, Feb 19 2015

STATUS

approved

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Last modified November 13 13:15 EST 2018. Contains 317149 sequences. (Running on oeis4.)