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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A222918 T(n,k)=Number of nXk 0..2 arrays with exactly floor(nXk/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 6
1, 0, 0, 0, 6, 0, 6, 18, 18, 6, 16, 136, 160, 136, 16, 16, 654, 2952, 2952, 654, 16, 40, 3972, 17518, 62336, 17518, 3972, 40, 280, 21778, 356398, 1309863, 1309863, 356398, 21778, 280, 768, 127226, 2118905, 27663713, 26742406, 27663713, 2118905, 127226, 768 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table starts

.....1........0..........0............6............16.............16

.....0........6.........18..........136...........654...........3972

.....0.......18........160.........2952.........17518.........356398

.....6......136.......2952........62336.......1309863.......27663713

....16......654......17518......1309863......26742406.....2133576918

....16.....3972.....356398.....27663713....2133576918...165904381397

....40....21778....2118905....590514107...43875762623.13105585711754

...280...127226...44960137..12759661261.3643286829221

...768...727214..272872198.278866376604

..1440..4237154.5911110630

..3808.24617576

.16352

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..84

EXAMPLE

Some solutions for n=3 k=4

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

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

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

CROSSREFS

Column 1 is A222884

Sequence in context: A341483 A223033 A237444 * A280480 A223104 A222722

Adjacent sequences:  A222915 A222916 A222917 * A222919 A222920 A222921

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Mar 09 2013

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 December 3 15:34 EST 2021. Contains 349463 sequences. (Running on oeis4.)