A252140 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7

1921, 2543, 5440, 5860, 18757, 24112, 108750, 114221, 618938, 567920, 3884323, 2961964, 24519726, 15344171, 161408146, 82783132

Offset

1,1

Comments

Diagonal of A252148

Links

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

Example

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

Crossrefs

Sequence in context: A249840 A061374 A282474 * A252148 A252141 A157448

Adjacent sequences: A252137 A252138 A252139 * A252141 A252142 A252143

Keyword

nonn

Author

R. H. Hardin, Dec 14 2014

Status

approved