login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A280216 Number of nX6 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 0
30, 1072, 20593, 320755, 4245153, 51995541, 607401930, 6826834071, 74866926296, 803333083744, 8481136146360, 88284309868714, 908465381543452, 9254692532815689, 93470995500319234 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A280217.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A280217.

Sequence in context: A001821 A027488 A269541 * A075187 A265101 A214820

Adjacent sequences:  A280213 A280214 A280215 * A280217 A280218 A280219

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 27 15:11 EST 2020. Contains 338683 sequences. (Running on oeis4.)