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A282833
Number of nX3 0..1 arrays with no 1 equal to more than one of its king-move neighbors, with the exception of exactly two elements.
1
0, 0, 18, 201, 1019, 6472, 34464, 176355, 887369, 4302058, 20526930, 96271353, 445135927, 2035082204, 9209605924, 41317597035, 183957537513, 813511053478, 3576027441566, 15634929421921, 68026641477831, 294677794352560
OFFSET
1,3
COMMENTS
Column 3 of A282838.
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +6*a(n-2) -40*a(n-3) -147*a(n-4) +90*a(n-5) +690*a(n-6) +1104*a(n-7) +153*a(n-8) -358*a(n-9) -534*a(n-10) +216*a(n-11) -617*a(n-12) +606*a(n-13) -330*a(n-14) +224*a(n-15) -84*a(n-16) +24*a(n-17) -8*a(n-18)
EXAMPLE
Some solutions for n=4
..0..0..1. .1..0..1. .0..1..0. .0..1..0. .1..0..0. .1..0..1. .1..0..0
..1..1..0. .0..0..1. .0..1..0. .0..0..1. .1..0..0. .1..0..1. .0..1..1
..0..0..0. .1..1..0. .0..1..0. .0..1..0. .1..0..1. .0..0..1. .0..0..0
..1..1..1. .0..0..1. .1..0..0. .1..0..0. .1..0..0. .1..0..1. .1..1..1
CROSSREFS
Cf. A282838.
Sequence in context: A181961 A250317 A250558 * A181400 A282020 A277763
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2017
STATUS
approved