login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A283489 Number of nX3 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element. 1
0, 2, 59, 576, 5444, 47712, 402588, 3304736, 26585976, 210604104, 1648084920, 12770161232, 98143291572, 749097112304, 5684201101568, 42914522732568, 322570735588252, 2415252852914064, 18022243345734636, 134067764826183784 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A283494.

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) +a(n-2) -110*a(n-3) -267*a(n-4) -266*a(n-5) -146*a(n-6) -72*a(n-7) -41*a(n-8) -4*a(n-9) -4*a(n-10) for n>13

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283494.

Sequence in context: A100273 A138982 A142666 * A051055 A003827 A241324

Adjacent sequences:  A283486 A283487 A283488 * A283490 A283491 A283492

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 08 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 18 14:59 EST 2019. Contains 329262 sequences. (Running on oeis4.)