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A316804 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 1
8, 128, 1905, 28248, 420345, 6256258, 93109949, 1385723098, 20623265507, 306929355068, 4567929663745, 67983009966484, 1011769004146827, 15057828687751316, 224100761989675875, 3335218680314293250 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A316808.
LINKS
FORMULA
Empirical: a(n) = 15*a(n-1) -5*a(n-2) +50*a(n-3) -18*a(n-4) -81*a(n-5) +4*a(n-6) +20*a(n-7)
EXAMPLE
Some solutions for n=5
..0..0..0..1. .0..0..1..0. .0..0..0..1. .0..0..0..0. .0..0..0..1
..1..0..0..1. .0..0..0..0. .1..1..1..1. .1..0..0..1. .1..0..0..1
..1..0..1..1. .1..1..1..1. .1..1..0..1. .1..0..1..0. .0..0..1..1
..0..0..0..0. .0..0..1..0. .0..1..0..0. .1..1..0..1. .1..1..0..0
..1..1..1..1. .0..1..0..0. .1..0..0..1. .0..0..1..0. .0..1..0..0
CROSSREFS
Cf. A316808.
Sequence in context: A302011 A301780 A348804 * A317521 A299650 A300204
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 14 2018
STATUS
approved

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Last modified February 26 21:28 EST 2024. Contains 370352 sequences. (Running on oeis4.)