A252550 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7

771, 889, 4006, 24336, 474384, 11035929, 145399017, 11588408619, 935064459875, 22633591925091, 7894058596204955, 2202850896886112644, 91560065934888121868

Offset

1,1

Comments

Diagonal of A252558

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A205357 A252551 A045078 * A252558 A252559 A259696

Adjacent sequences: A252547 A252548 A252549 * A252551 A252552 A252553

Keyword

nonn

Author

R. H. Hardin, Dec 18 2014

Status

approved