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A253024 Number of (n+2)X(7+2) 0..3 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
189, 243, 302, 369, 554, 720, 920, 1312, 1616, 1976, 2784, 3472, 4272, 6096, 7664, 9464, 13504, 16952, 20904, 29792, 37384, 46080, 65680, 82448, 101624, 144864, 181872, 224152, 319520, 401168, 494384, 704720, 884848, 1090392, 1554304 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A253025
LINKS
FORMULA
Empirical: a(n) = 3*a(n-3) -a(n-6) -a(n-9) -a(n-12) -a(n-15) for n>20
EXAMPLE
Some solutions for n=4
..0..1..2..0..3..2..0..1..2....0..1..2..3..1..2..0..1..2
..0..0..0..0..0..0..0..0..0....2..2..2..2..2..2..2..2..2
..0..2..3..0..2..1..0..2..1....1..3..2..1..0..2..1..0..2
..0..3..2..0..1..2..0..1..2....3..1..2..0..1..2..0..1..2
..0..0..0..0..0..0..0..0..0....2..2..2..2..2..2..2..2..2
..0..2..1..0..2..1..0..2..1....1..0..2..1..0..2..1..0..2
CROSSREFS
Sequence in context: A065612 A088264 A068557 * A031901 A348160 A320709
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 26 2014
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)