A252313 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7

1557, 1974, 2493, 23422, 505062, 17562749, 937981280, 77093724660, 9818091215415, 1923038551367392, 579363831611000707, 269256446506102901260, 192945586040744107580301

Offset

1,1

Comments

Diagonal of A252321

Links

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

Example

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

Crossrefs

Sequence in context: A229434 A022222 A166606 * A252321 A252314 A186393

Adjacent sequences: A252310 A252311 A252312 * A252314 A252315 A252316

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved