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A283126 Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal and vertical neighbors. 1
16, 209, 2521, 30824, 376359, 4598361, 56176300, 686250407, 8383419717, 102414019954, 1251114819113, 15283928745831, 186712266641032, 2280923364802115, 27864325608995985, 340397513549872208 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A283130.

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +26*a(n-2) +147*a(n-3) +173*a(n-4) +239*a(n-5) -710*a(n-6) -328*a(n-7) +319*a(n-8) -316*a(n-9) -271*a(n-10) +194*a(n-11) +8*a(n-12) -167*a(n-13) +28*a(n-14) +70*a(n-15) -2*a(n-16) -8*a(n-17)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283130.

Sequence in context: A297370 A285167 A283694 * A295712 A319236 A222447

Adjacent sequences:  A283123 A283124 A283125 * A283127 A283128 A283129

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 01 2017

STATUS

approved

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Last modified February 22 08:42 EST 2020. Contains 332133 sequences. (Running on oeis4.)