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A304771 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3 or 7 king-move adjacent elements, with upper left element zero. 1
8, 49, 67, 172, 443, 1094, 2710, 6861, 17205, 43090, 108354, 272151, 683041, 1715450, 4308348, 10818085, 27165863, 68220510, 171312464, 430193109, 1080297705, 2712821764, 6812367886, 17107084553, 42958966889, 107877614976, 270899989904 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304775.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +6*a(n-3) +3*a(n-4) +a(n-5) -3*a(n-6) -4*a(n-7) -4*a(n-8) -2*a(n-9) +2*a(n-10) for n>13

EXAMPLE

Some solutions for n=5

..0..0..0..1. .0..0..0..1. .0..1..1..0. .0..1..1..1. .0..1..0..0

..0..1..0..0. .0..0..1..0. .1..1..1..1. .1..1..1..1. .1..1..1..0

..0..1..0..0. .0..0..0..0. .1..1..1..1. .1..1..1..1. .1..1..1..1

..0..0..0..0. .0..1..0..0. .1..1..0..1. .1..1..1..1. .1..1..0..1

..0..0..0..1. .1..0..0..0. .0..1..1..0. .0..1..1..0. .0..1..1..0

CROSSREFS

Cf. A304775.

Sequence in context: A355434 A303723 A305226 * A316514 A352179 A304468

Adjacent sequences:  A304768 A304769 A304770 * A304772 A304773 A304774

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 18 2018

STATUS

approved

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Last modified August 18 10:29 EDT 2022. Contains 356211 sequences. (Running on oeis4.)