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A283859 Number of 3Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors. 1
8, 64, 409, 2776, 19220, 131617, 901397, 6182652, 42392411, 290633973, 1992674389, 13662396421, 93672704694, 642244067806, 4403393953741, 30190811094903, 206996026936933, 1419218513242242, 9730530558373154, 66715043135972866 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A283857.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +5*a(n-2) +50*a(n-3) +21*a(n-4) +11*a(n-5) -67*a(n-6) -229*a(n-7) -116*a(n-8) +41*a(n-9) +116*a(n-10) +66*a(n-11) +15*a(n-12) +a(n-13) -2*a(n-14)

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A283857.

Sequence in context: A218267 A189105 A181214 * A222446 A239034 A213296

Adjacent sequences:  A283856 A283857 A283858 * A283860 A283861 A283862

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 17 2017

STATUS

approved

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Last modified January 20 03:25 EST 2022. Contains 350467 sequences. (Running on oeis4.)