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!)
A208039 T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 1 0 1 vertically 10
2, 4, 4, 6, 16, 6, 9, 36, 36, 9, 15, 81, 102, 81, 13, 25, 225, 289, 279, 169, 19, 40, 625, 1071, 961, 741, 361, 28, 64, 1600, 3969, 4743, 3249, 1995, 784, 41, 104, 4096, 13230, 23409, 21147, 11025, 5404, 1681, 60, 169, 10816, 44100, 100215, 137641, 94605 (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...102....289....1071.....3969.....13230......44100......153090

..9...81...279....961....4743....23409....100215.....429025.....1942075

.13..169...741...3249...21147...137641....766115....4264225....25232235

.19..361..1995..11025...94605...811801...5866411...42393121...327288437

.28..784..5404..37249..422477..4791721..44918280..421070400..4242161160

.41.1681.14555.126025.1889665.28334329.344414069.4186478209.55078752265

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..450

EXAMPLE

Some solutions for n=4 k=3

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

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

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

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

CROSSREFS

Column 1 is A000930(n+3)

Column 2 is A207170

Column 3 is A208023

Column 4 is A141583(n+3) for n>1

Row 1 is A006498(n+2)

Row 2 is A189145(n+2)

Row 3 is A207704

Sequence in context: A207729 A208118 A207908 * A207426 A207741 A207949

Adjacent sequences:  A208036 A208037 A208038 * A208040 A208041 A208042

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 22 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 December 4 04:49 EST 2021. Contains 349469 sequences. (Running on oeis4.)