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A268746 Number of nX4 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once. 1
13, 89, 623, 4110, 26334, 165019, 1016807, 6183665, 37209717, 221970102, 1314544140, 7737069617, 45297553803, 263980824665, 1532201345489, 8861529601362, 51088246525260, 293694819166095, 1684057081243885 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A268750.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +2*a(n-2) -82*a(n-3) -49*a(n-4) +124*a(n-5) +39*a(n-6) -58*a(n-7) -6*a(n-8) +8*a(n-9) -a(n-10)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268750.

Sequence in context: A181508 A082099 A282858 * A152867 A026912 A161465

Adjacent sequences:  A268743 A268744 A268745 * A268747 A268748 A268749

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 12 2016

STATUS

approved

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Last modified April 6 18:42 EDT 2020. Contains 333286 sequences. (Running on oeis4.)