login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A281649 Number of nX3 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
1, 70, 985, 10572, 104815, 982206, 8921869, 79152992, 690169163, 5936924514, 50519131945, 426076889988, 3566942546599, 29673740170566, 245529558834373, 2022092139217448, 16585031242812675, 135537068349013930 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A281653.

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -29*a(n-2) -192*a(n-3) +136*a(n-4) +1336*a(n-5) +1164*a(n-6) -2528*a(n-7) -6176*a(n-8) -5120*a(n-9) -1600*a(n-10) for n>13

EXAMPLE

Some solutions for n=4

..0..1..2. .0..1..0. .0..0..1. .0..0..1. .0..1..1. .0..1..0. .0..1..2

..2..0..1. .0..0..0. .1..0..1. .0..1..0. .2..0..2. .2..2..0. .0..1..1

..2..2..2. .2..1..0. .1..2..1. .2..1..0. .2..0..1. .2..1..0. .0..1..2

..0..1..0. .0..2..1. .1..0..0. .0..2..0. .1..1..2. .0..1..2. .2..0..2

CROSSREFS

Cf. A281653.

Sequence in context: A251933 A061170 A125114 * A189413 A229735 A254472

Adjacent sequences: A281646 A281647 A281648 * A281650 A281651 A281652

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 26 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 29 07:25 EST 2023. Contains 359915 sequences. (Running on oeis4.)