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A230270 Number of nX3 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 1
0, 2, 28, 258, 2318, 19996, 173042, 1495602, 12923884, 111679970, 965051522, 8339221132, 72061022634, 622694890854, 5380841364452, 46497015154242, 401790774458110, 3471961070277860, 30001967293824306, 259253494870328354 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A230275

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) -18*a(n-2) -22*a(n-3) -6*a(n-4) +162*a(n-5) -29*a(n-6) -105*a(n-7) -62*a(n-8) -22*a(n-9) -4*a(n-10)

EXAMPLE

Some solutions for n=3

..0..2..1....0..1..2....0..2..1....0..1..0....0..2..0....0..1..2....0..1..2

..1..2..0....2..1..0....1..1..1....1..2..2....1..1..1....0..0..0....2..0..0

..0..1..0....0..1..2....2..0..2....0..0..1....2..0..2....1..2..1....1..2..1

CROSSREFS

Sequence in context: A183067 A056261 A326248 * A230759 A229581 A230589

Adjacent sequences: A230267 A230268 A230269 * A230271 A230272 A230273

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 14 2013

STATUS

approved

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Last modified February 1 08:20 EST 2023. Contains 359992 sequences. (Running on oeis4.)