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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

R. H. Hardin, Table of n, a(n) for n = 1..210

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 * A119417 A287767 A050961

Adjacent sequences:  A252685 A252686 A252687 * A252689 A252690 A252691

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2014

STATUS

approved

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Last modified August 13 22:39 EDT 2022. Contains 356109 sequences. (Running on oeis4.)