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A252688 Number of (n+2)X(1+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and in every diagonal and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order 1
46, 96, 148, 394, 707, 1982, 3703, 10772, 20437, 60042, 115343, 338174, 656519, 1913418, 3749109, 10848316, 21436803, 61563668, 122626571, 349539732, 701532497, 1985146994, 4013145959, 11276488886, 22954622815, 64065149914 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A252695
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +9*a(n-2) -15*a(n-3) -30*a(n-4) +21*a(n-5) +80*a(n-6) +18*a(n-7) -132*a(n-8) -76*a(n-9) +88*a(n-10) +108*a(n-11) -32*a(n-12) -40*a(n-13) for n>14
EXAMPLE
Some solutions for n=4
..0..1..0....0..1..0....0..1..0....0..1..1....0..1..1....0..1..0....0..0..1
..2..1..2....2..3..2....2..1..2....2..3..2....2..3..2....2..1..2....2..0..0
..2..3..2....2..1..2....2..0..2....2..3..2....2..1..2....2..3..2....2..2..0
..0..1..0....0..3..0....1..0..1....0..2..0....0..3..0....1..3..1....3..2..2
..0..1..0....0..3..0....1..2..1....2..3..2....0..3..0....1..0..1....3..3..2
..2..2..3....1..2..2....3..0..3....2..3..2....2..1..2....3..3..2....1..3..3
CROSSREFS
Sequence in context: A044184 A044565 A252695 * A358897 A119417 A287767
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2014
STATUS
approved

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Last modified June 20 13:37 EDT 2024. Contains 373527 sequences. (Running on oeis4.)