A252344 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 8

562, 1386, 6986, 40756, 592230, 11021412, 249626459, 15316883573, 776195661759, 48304754871426, 11765535679080573, 1482895646097699360, 245504085165829558660, 254091374667549037155557

Offset

1,1

Comments

Diagonal of A252352

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4
..3..1..3..0..1..0....2..3..2..2..3..2....3..1..3..0..1..3....0..3..1..3..0..1
..2..0..2..2..3..2....3..1..0..3..1..0....2..0..2..2..3..2....2..2..3..2..2..0
..2..3..2..2..3..2....2..3..2..2..3..2....2..3..2..2..0..2....2..2..3..2..2..0
..0..1..3..3..1..3....2..0..2..2..3..2....3..1..3..3..1..3....3..3..1..3..3..1
..2..3..2..2..3..2....3..1..3..3..1..0....2..3..2..2..0..2....2..2..0..2..2..0
..2..3..2..2..0..2....2..0..2..2..0..0....2..0..2..2..0..2....2..2..0..2..2..0

Crossrefs

Sequence in context: A252352 A252345 A121508 * A250976 A209907 A232679

Adjacent sequences: A252341 A252342 A252343 * A252345 A252346 A252347

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved