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A233087 Number of 6Xn 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order 1
528, 88574, 18378455, 3813415862, 793945203881, 165407945648306, 34467813715307081, 7182856170260722382, 1496883957083674317113, 311947255924268504837126, 65009188480607928117152141 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A233082

LINKS

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

FORMULA

Empirical: a(n) = 364*a(n-1) -42453*a(n-2) +2436880*a(n-3) -79344169*a(n-4) +1516939086*a(n-5) -15628675074*a(n-6) +36294613392*a(n-7) +1123346476671*a(n-8) -14527002142968*a(n-9) +69635812750065*a(n-10) +6662468719530*a(n-11) -1637269772485123*a(n-12) +7134485019071854*a(n-13) -7393831633937490*a(n-14) -32355982109640858*a(n-15) +109448357570150022*a(n-16) -81722247403429008*a(n-17) -136631578511246112*a(n-18) +284995956546214704*a(n-19) -170571098629086336*a(n-20) +28670292192657024*a(n-21) for n>26

EXAMPLE

Some solutions for n=2

..0..1....0..1....0..1....0..1....0..0....0..1....0..1....0..0....0..0....0..0

..3..2....3..3....3..2....3..3....1..3....1..3....1..0....0..1....1..1....1..0

..3..3....3..2....3..2....1..1....1..3....2..3....2..3....3..1....0..2....2..3

..1..1....0..0....3..3....1..1....2..2....3..3....1..0....1..1....0..1....1..0

..0..0....2..2....3..1....0..1....0..2....1..3....2..2....1..3....0..0....2..2

..0..1....2..3....3..1....1..3....0..2....2..2....3..1....2..0....1..1....0..2

CROSSREFS

Sequence in context: A059465 A071236 A048101 * A008690 A282292 A225834

Adjacent sequences:  A233084 A233085 A233086 * A233088 A233089 A233090

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 03 2013

STATUS

approved

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Last modified September 18 06:26 EDT 2020. Contains 337166 sequences. (Running on oeis4.)