A204390 Number of (n+2) X (n+2) 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order.

144, 4050, 259808, 25233408, 5406738528, 2134049909922, 1597165262402016, 2318118449955569282, 6416215460503014746112, 33850489754410068455670578, 342799382812784238626135423232, 6643766502379498331477812982056992, 246072986103855571464930683870772611680

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some solutions for n=3:
..0..1..1..0..1....0..0..0..1..1....0..1..0..1..1....0..1..1..1..0
..0..1..0..1..1....0..1..1..0..0....1..1..0..1..1....1..1..1..1..0
..0..1..0..0..0....1..0..0..1..1....1..0..0..0..0....0..0..1..0..0
..1..0..1..0..1....0..1..1..1..0....1..0..1..0..1....0..0..1..0..0
..1..0..1..0..1....1..0..0..0..1....1..1..1..0..1....1..1..1..1..0

Crossrefs

Diagonal of A204398.

Sequence in context: A128989 A257298 A271672 * A343295 A008376 A221127

Adjacent sequences: A204387 A204388 A204389 * A204391 A204392 A204393

Keyword

nonn,changed

Author

R. H. Hardin, Jan 15 2012

Status

approved