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!)
A207248 Number of n X n 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically 1
2, 16, 102, 940, 9072, 101036, 1231650, 16436824, 237255370, 3684061372, 61152471648, 1079792961548, 20191392448058, 398344602963240, 8263930584283206, 179759826117751524, 4089350929606635216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207254

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..70

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207902 A267713 A207746 * A208033 A208159 A208282

Adjacent sequences:  A207245 A207246 A207247 * A207249 A207250 A207251

KEYWORD

nonn

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 September 28 21:22 EDT 2021. Contains 347717 sequences. (Running on oeis4.)