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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

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

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: A302006 A302011 A301780 * A317521 A299650 A300204

Adjacent sequences:  A316801 A316802 A316803 * A316805 A316806 A316807

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 14 2018

STATUS

approved

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Last modified April 10 10:25 EDT 2021. Contains 342845 sequences. (Running on oeis4.)