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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 0
1921, 2543, 5440, 5860, 18757, 24112, 108750, 114221, 618938, 567920, 3884323, 2961964, 24519726, 15344171, 161408146, 82783132 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 7 13:08 EST 2021. Contains 349581 sequences. (Running on oeis4.)