A222282 - OEIS

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A222282

Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order

1, 0, 4, 208, 6582, 1249354, 262048125, 288902941734, 350421368609396

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Diagonal of A222290

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A129465 A300152 A260639 * A087924 A201978 A081787

Adjacent sequences: A222279 A222280 A222281 * A222283 A222284 A222285

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2013

STATUS

approved