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!)
A207426 T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically 12
2, 4, 4, 6, 16, 6, 9, 36, 36, 9, 15, 81, 114, 81, 14, 25, 225, 361, 351, 196, 21, 40, 625, 1425, 1521, 1162, 441, 31, 64, 1600, 5625, 8463, 6889, 3633, 961, 46, 104, 4096, 20550, 47089, 55361, 29929, 11067, 2116, 68, 169, 10816, 75076, 241087, 444889, 341329 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

..2....4.....6......9.......15........25.........40...........64...........104

..4...16....36.....81......225.......625.......1600.........4096.........10816

..6...36...114....361.....1425......5625......20550........75076........282494

..9...81...351...1521.....8463.....47089.....241087......1234321.......6520459

.14..196..1162...6889....55361....444889....3210938.....23174596.....174570082

.21..441..3633..29929...341329...3892729...39698733....404854641....4315250265

.31..961.11067.127449..2048823..32936121..474552171...6837470721..102807481767

.46.2116.33994.546121.12436631.283215241.5755114104.116947584576.2485504480392

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..365

EXAMPLE

Some solutions for n=4 k=3

..0..1..1....1..1..0....0..1..1....1..1..0....1..0..0....0..1..1....1..1..1

..1..1..0....0..0..1....0..1..1....1..0..1....0..0..1....1..0..0....1..1..1

..1..1..1....0..1..1....0..1..1....1..0..1....1..0..1....1..0..1....1..1..1

..1..0..1....0..1..1....0..1..1....0..0..1....1..0..0....1..0..1....1..1..1

CROSSREFS

Column 1 is A038718(n+2)

Column 2 is A207069

Row 1 is A006498(n+2)

Row 2 is A189145(n+2)

Sequence in context: A208118 A207908 A208039 * A207741 A207949 A207346

Adjacent sequences:  A207423 A207424 A207425 * A207427 A207428 A207429

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 17 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 May 10 22:16 EDT 2021. Contains 343780 sequences. (Running on oeis4.)