A231133 Number of (n+1)X(n+1) black-square subarrays of 0..2 arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order

1, 9, 308, 27171, 6794904, 4509445997, 8349491299560, 41122867660973690, 564457878709147238868, 20611335365445954476620968, 2097381737046509117354544061212, 567772314049031950964995256826728363

Offset

1,2

Comments

Diagonal of A231137

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..x..0..x..1..x....x..0..x..1..x....x..0..x..0..x....x..0..x..0..x
..2..x..0..x..2....1..x..2..x..2....1..x..0..x..1....0..x..1..x..2
..x..0..x..1..x....x..0..x..0..x....x..1..x..1..x....x..2..x..1..x
..1..x..0..x..0....2..x..1..x..2....0..x..2..x..0....1..x..2..x..1
..x..2..x..1..x....x..0..x..1..x....x..2..x..2..x....x..0..x..0..x

Crossrefs

Sequence in context: A279449 A152437 A296802 * A163702 A160194 A217145

Adjacent sequences: A231130 A231131 A231132 * A231134 A231135 A231136

Keyword

nonn

Author

R. H. Hardin, Nov 04 2013

Status

approved