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A230521 Number of nX3 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 1
0, 78, 1408, 29618, 627350, 13230788, 279167078, 5890518102, 124290232064, 2622533790338, 55335676702862, 1167587239742436, 24636184990146910, 519825491749928782, 10968359831136839008, 231433277698034342442 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A230526

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) +74*a(n-2) +257*a(n-3) +159*a(n-4) -208*a(n-5) -590*a(n-6) -120*a(n-7) +48*a(n-8) +48*a(n-9)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A027786 A175383 A190396 * A264362 A160839 A187590

Adjacent sequences:  A230518 A230519 A230520 * A230522 A230523 A230524

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 22 2013

STATUS

approved

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Last modified November 17 23:26 EST 2019. Contains 329242 sequences. (Running on oeis4.)