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, 2, 6, 18, 232, 5304, 227270, 18030130, 2764522654, 770199142784

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