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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207228 T(n,k)=Number of nXk 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal 7
3, 9, 9, 23, 81, 23, 61, 529, 529, 61, 161, 3721, 6819, 3721, 161, 425, 25921, 100997, 100997, 25921, 425, 1121, 180625, 1482361, 3447649, 1482361, 180625, 1121, 2957, 1256641, 21553541, 115679881, 115679881, 21553541, 1256641, 2957, 7801, 8743849 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

....3.......9.........23............61..............161.................425

....9......81........529..........3721............25921..............180625

...23.....529.......6819........100997..........1482361............21553541

...61....3721.....100997.......3447649........115679881..........3814387801

..161...25921....1482361.....115679881.......8779228417........648206318305

..425..180625...21553541....3814387801.....648206318305.....105855104360481

.1121.1256641..312522517..125372637881...47644493869633...17182219699443153

.2957.8743849.4536114221.4126073501121.3508487676429289.2796398012458324953

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..143

EXAMPLE

Some solutions for n=4 k=3

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

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

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

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

CROSSREFS

Column 1 is A207008

Column 2 is A207009

Sequence in context: A223975 A226852 A207235 * A207015 A268809 A268628

Adjacent sequences:  A207225 A207226 A207227 * A207229 A207230 A207231

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 16 2012

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 August 10 14:50 EDT 2020. Contains 336381 sequences. (Running on oeis4.)