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!)
A268802 Number of n X n 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once. 1
3, 34, 332, 5848, 195384, 12432856, 1508087180, 348686105792, 154172619407288, 130573457756588328, 212323461305457440492, 663970589813116610557692, 3999438097971983178736358520, 46462227980008803491191644654968 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A268809.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268809.

Sequence in context: A024396 A246384 A066265 * A284891 A231593 A134491

Adjacent sequences:  A268799 A268800 A268801 * A268803 A268804 A268805

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2016

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 August 17 05:07 EDT 2022. Contains 356184 sequences. (Running on oeis4.)