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!)
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: A165071 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 November 25 14:15 EST 2020. Contains 338623 sequences. (Running on oeis4.)