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A252186
Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.
1
1440, 1886, 2610, 3996, 6368, 9508, 15094, 24092, 36352, 58610, 94310, 142892, 231354, 373418, 566836, 919562, 1486322, 2258180, 3666858, 5930882, 9014692, 14644970, 23695010, 36023012, 58535274, 94723298, 144020836, 234052202
OFFSET
1,1
COMMENTS
Column 2 of A252192.
LINKS
FORMULA
Empirical: a(n) = 7*a(n-3) -14*a(n-6) +8*a(n-9) for n>16.
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..1..2..0....1..2..3..1....2..0..1..2....3..3..1..3
..0..2..1..0....3..2..1..0....2..1..0..0....0..0..3..3....1..2..3..2
..3..1..2..3....0..3..3..0....0..3..0..0....1..3..2..1....2..2..3..2
..0..0..3..0....0..1..2..0....1..2..3..1....2..3..1..2....3..3..1..3
..3..2..1..0....0..2..1..0....2..1..0..2....3..0..0..0....2..2..3..1
..0..1..2..3....0..3..0..3....0..3..0..0....1..0..2..1....2..2..3..2
CROSSREFS
Cf. A252192.
Sequence in context: A101998 A174277 A063846 * A179691 A078095 A157508
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2014
STATUS
approved