A252256 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 3 6 or 7.

1072, 1016, 596, 1316, 3530, 9836, 33218, 252162, 1017410, 4251650, 95453186, 461119490, 2176843778, 165104582658, 884163477506, 4458176053250

Offset

1,1

Comments

Diagonal of A252260

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Sequence in context: A020386 A236870 A345904 * A345525 A345779 A252257

Adjacent sequences: A252253 A252254 A252255 * A252257 A252258 A252259

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved