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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A283686 Number of nX3 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors. 1
8, 49, 264, 1525, 8732, 49924, 285770, 1635402, 9359104, 53561285, 306524651, 1754204129, 10039103443, 57452599764, 328794429339, 1881651609689, 10768469471919, 61626676386770, 352682175698390, 2018358353003843 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A283691.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +2*a(n-2) +14*a(n-3) -9*a(n-4) +2*a(n-5) -45*a(n-6) -20*a(n-7) -6*a(n-8) +24*a(n-9) +40*a(n-10)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283691.

Sequence in context: A270007 A166789 A081901 * A026389 A005059 A026719

Adjacent sequences:  A283683 A283684 A283685 * A283687 A283688 A283689

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 14 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 March 18 12:10 EDT 2019. Contains 321283 sequences. (Running on oeis4.)