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A316213
Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
1
4, 14, 28, 75, 250, 706, 2116, 6399, 19179, 57552, 173123, 520515, 1564516, 4704272, 14144805, 42529166, 127877045, 384503591, 1156133200, 3476296651, 10452650138, 31429406405, 94503128515, 284155666181, 854410380210, 2569074895741
OFFSET
1,1
COMMENTS
Column 3 of A316218.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +4*a(n-2) +5*a(n-3) -13*a(n-4) -31*a(n-5) -25*a(n-6) +30*a(n-7) +75*a(n-8) +66*a(n-9) -11*a(n-10) -52*a(n-11) -18*a(n-12) -12*a(n-13) -24*a(n-14) -27*a(n-15) for n>16
EXAMPLE
Some solutions for n=5
..0..0..0. .0..1..0. .0..1..0. .0..0..0. .0..1..0. .0..1..0. .0..0..0
..0..0..0. .0..0..0. .1..0..0. .1..0..1. .0..0..0. .1..0..0. .1..0..0
..0..0..1. .1..0..0. .0..0..0. .1..0..1. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .1..0..0. .0..0..0. .0..0..0. .0..0..1. .0..0..1. .0..0..0
..0..1..0. .1..1..1. .1..1..0. .0..0..0. .0..0..0. .0..0..1. .0..1..1
CROSSREFS
Cf. A316218.
Sequence in context: A130439 A289179 A033690 * A296985 A338311 A244714
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 26 2018
STATUS
approved