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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 0
1557, 1974, 2493, 23422, 505062, 17562749, 937981280, 77093724660, 9818091215415, 1923038551367392, 579363831611000707, 269256446506102901260, 192945586040744107580301 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 29 05:44 EDT 2022. Contains 354910 sequences. (Running on oeis4.)