A232918 - OEIS

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A232918

Number of nX6 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally

96, 1080, 13992, 186720, 2515716, 33994188, 459797904, 6221092260, 84180552504, 1139126465856, 15414771639624, 208595002222596, 2822742415594800, 38197837835124312, 516899809502860032, 6994778773839006000

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 6 of A232920

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -56*a(n-2) -81*a(n-3) +280*a(n-4) +12*a(n-5) -259*a(n-6) +78*a(n-7) +24*a(n-8) -5*a(n-9)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A202583 A027628 A182684 * A187165 A229533 A282017

Adjacent sequences: A232915 A232916 A232917 * A232919 A232920 A232921

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 02 2013

STATUS

approved