A222321 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..1 order

1, 0, 4, 52, 674, 38238, 2284728, 620488671, 174162198742, 206752746752932

Offset

1,3

Comments

Diagonal of A222328

Links

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

Example

Some solutions for n=4
..0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..1
..1..0..0..0....1..0..0..0....0..0..0..0....1..1..1..1....0..0..0..1
..1..0..0..0....0..0..0..0....0..0..0..1....1..1..1..1....0..0..0..1
..0..0..0..0....0..0..0..0....0..0..1..1....1..1..1..1....0..0..0..1

Crossrefs

Sequence in context: A155661 A198281 A220933 * A222138 A006760 A144340

Adjacent sequences: A222318 A222319 A222320 * A222322 A222323 A222324

Keyword

nonn

Author

R. H. Hardin Feb 15 2013

Status

approved