A252122 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 4 6 or 7

380, 1732, 25017, 106631, 4795018, 515273273, 2318294384, 811073548890, 638092781836452, 2811163183497319, 7197579550558730338, 39177279320409985651205, 173573852999518870312297

Offset

1,1

Comments

Diagonal of A252130

Links

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

Example

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

Crossrefs

Sequence in context: A252130 A252123 A158597 * A250635 A233952 A259520

Adjacent sequences: A252119 A252120 A252121 * A252123 A252124 A252125

Keyword

nonn

Author

R. H. Hardin, Dec 14 2014

Status

approved