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A252308
Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7
1
1303, 1168, 1677, 2287, 3902, 6103, 8650, 14935, 23660, 33855, 58675, 93344, 134047, 232723, 370928, 533559, 927091, 1478960, 2129095, 3700915, 5906480, 8506215, 14788915, 23607344, 34004647, 59126323, 94392368, 135978279, 236446771
OFFSET
1,1
COMMENTS
Row 3 of A252305
LINKS
FORMULA
Empirical: a(n) = 7*a(n-3) -14*a(n-6) +8*a(n-9) for n>15
EXAMPLE
Some solutions for n=4
..2..3..1..2..0..1....2..0..1..2..3..1....0..1..2..3..1..2....3..3..1..2..0..1
..0..0..0..3..3..0....0..0..0..0..3..0....0..0..0..3..0..0....2..1..0..2..1..0
..3..2..1..0..2..1....3..2..1..0..2..1....2..1..0..2..1..0....0..0..3..0..3..3
..2..0..1..2..3..1....2..3..1..2..3..1....3..1..2..3..1..2....2..3..1..2..0..1
..3..3..0..0..3..3....0..3..0..0..0..0....3..0..0..3..0..3....2..1..0..2..1..0
CROSSREFS
Sequence in context: A250728 A071847 A014356 * A277772 A252844 A252845
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 16 2014
STATUS
approved