A252246 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 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 7

318, 239, 231, 267, 327, 405, 501, 657, 861, 1113, 1521, 2055, 2715, 3783, 5181, 6909, 9705, 13365, 17889, 25209, 34791, 46635, 65799

Offset

1,1

Comments

Diagonal of A252254

Links

Table of n, a(n) for n=1..23.

Example

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

Crossrefs

Sequence in context: A142130 A278279 A058002 * A252254 A252247 A323327

Adjacent sequences: A252243 A252244 A252245 * A252247 A252248 A252249

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved