A204343 Number of (n+2) X (n+2) 0..3 arrays with no 3 X 3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..3 introduced in row major order.

9672, 109655775, 16256855591536, 31112427702110512128, 769885056390910177755092784, 246208690739288821726563895377926727

Offset

1,1

Comments

Diagonal of A204351.

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=3
..0..1..0..2..1....0..0..0..0..0....0..1..0..2..0....0..1..1..0..0
..0..3..3..3..3....1..2..3..2..3....3..3..0..1..3....0..2..0..0..2
..3..2..1..3..1....1..1..1..3..3....2..1..1..2..1....1..1..3..1..0
..3..0..0..1..0....3..1..0..1..1....1..0..2..0..3....0..1..0..2..3
..2..0..2..1..2....3..2..3..0..2....0..0..2..1..1....2..1..2..0..3

Crossrefs

Cf. A204351.

Sequence in context: A238036 A204351 A204344 * A068362 A246228 A234819

Adjacent sequences: A204340 A204341 A204342 * A204344 A204345 A204346

Keyword

nonn

Author

R. H. Hardin, Jan 14 2012

Status

approved