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A283694 Number of 4Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors. 1
16, 209, 1525, 15226, 149840, 1392868, 13354587, 127784543, 1216273286, 11610922077, 110813421739, 1057079938750, 10086617186932, 96243278074212, 918282144099337, 8761803692242639, 83600613065810312, 797670758534028855 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A283691.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +14*a(n-2) +82*a(n-3) -658*a(n-4) -777*a(n-5) +1355*a(n-6) +5352*a(n-7) +4750*a(n-8) -10369*a(n-9) -8528*a(n-10) -2002*a(n-11) +1904*a(n-12) +11841*a(n-13) -569*a(n-14) -451*a(n-15) +1759*a(n-16) -3860*a(n-17) -536*a(n-18) +645*a(n-19) +66*a(n-20) +111*a(n-21) -40*a(n-22) -4*a(n-23)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283691.

Sequence in context: A016159 A297370 A285167 * A283126 A295712 A319236

Adjacent sequences:  A283691 A283692 A283693 * A283695 A283696 A283697

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 14 2017

STATUS

approved

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Last modified March 28 17:51 EDT 2020. Contains 333103 sequences. (Running on oeis4.)