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A283860 Number of 4Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors. 1
16, 256, 2837, 35373, 456316, 5742620, 72394838, 916118713, 11578902038, 146303878883, 1849120160189, 23370319192081, 295356801554484, 3732805298242779, 47176419243543777, 596229278644402659 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A283857.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +28*a(n-2) +366*a(n-3) +386*a(n-4) -779*a(n-5) -7223*a(n-6) -24938*a(n-7) -38986*a(n-8) -8415*a(n-9) +26074*a(n-10) -17823*a(n-11) -21705*a(n-12) +40001*a(n-13) +40567*a(n-14) -22002*a(n-15) -44398*a(n-16) +15085*a(n-17) +24099*a(n-18) +3105*a(n-19) -1004*a(n-20) -3751*a(n-21) -1424*a(n-22) +52*a(n-23) +59*a(n-24) -894*a(n-25) -146*a(n-26) +193*a(n-27) -14*a(n-28)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283857.

Sequence in context: A223617 A174335 A297377 * A223660 A223565 A223677

Adjacent sequences:  A283857 A283858 A283859 * A283861 A283862 A283863

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 17 2017

STATUS

approved

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Last modified December 9 05:30 EST 2021. Contains 349627 sequences. (Running on oeis4.)