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A240643 Number of n X n 0..1 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..1 introduced in row major order 0
0, 2, 6, 18, 232, 5304, 227270, 18030130, 2764522654, 770199142784 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A240649

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

..0..0..0..1....0..0..0..0....0..1..0..1....0..0..0..0....0..1..1..0

..1..1..1..1....1..1..0..1....0..1..0..1....1..1..1..1....0..0..0..0

..0..1..0..1....0..0..0..1....0..1..0..1....0..0..0..0....0..0..0..0

..0..1..0..1....1..1..0..1....0..1..0..1....1..1..1..1....0..1..1..0

CROSSREFS

Sequence in context: A208456 A056743 A064535 * A262971 A253380 A128123

Adjacent sequences:  A240640 A240641 A240642 * A240644 A240645 A240646

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2014

STATUS

approved

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Last modified February 18 04:48 EST 2020. Contains 332011 sequences. (Running on oeis4.)