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A252026
Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 or 4.
1
227, 323, 781, 1929, 5285, 14831, 41745, 117867, 332997, 941237, 2660915, 7523177, 21271317, 60144341, 170058799, 480846469, 1359611219, 3844354431, 10870074659, 30735606793, 86906264441, 245731273709, 694815999081, 1964622840375
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OFFSET
1,1
COMMENTS
Column 2 of
A252032
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) -a(n-2) +6*a(n-3) -12*a(n-4) -3*a(n-5) -a(n-6) +6*a(n-7) +a(n-8) +6*a(n-9) +a(n-10) +3*a(n-11) -3*a(n-12) -3*a(n-13) -2*a(n-14) for n>18
EXAMPLE
Some solutions for n=4
..2..2..2..1....2..0..1..2....1..2..2..2....2..2..1..2....2..2..2..2
..2..2..2..2....0..1..2..2....2..1..2..2....2..1..2..2....2..2..2..2
..2..2..2..2....1..2..2..1....2..2..1..2....1..2..2..2....2..2..2..2
..1..2..2..2....2..2..1..2....1..2..2..1....2..2..2..2....2..2..1..2
..2..2..2..2....2..1..2..2....0..1..2..2....2..1..2..2....1..2..2..2
..2..1..2..2....1..2..2..1....0..2..1..2....2..2..2..1....2..2..2..1
CROSSREFS
Sequence in context:
A333425
A142261
A117458
*
A210513
A142842
A142545
Adjacent sequences:
A252023
A252024
A252025
*
A252027
A252028
A252029
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Dec 12 2014
STATUS
approved
