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!)
A208032 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 0 1 vertically 1
28, 784, 5404, 61292, 574560, 5788524, 56728924, 561913408, 5542832148, 54764938004, 540744613920, 5340655599188, 52741354585556, 520866777405464, 5143921470354156, 50800175218659076, 501689190833405736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A208028

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 5*a(n-1) +62*a(n-2) -73*a(n-3) -736*a(n-4) +779*a(n-5) +3097*a(n-6) -3814*a(n-7) -4207*a(n-8) +5531*a(n-9) +2469*a(n-10) -2932*a(n-11) -644*a(n-12) +428*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A267785 A223496 A208043 * A264368 A224266 A223923

Adjacent sequences:  A208029 A208030 A208031 * A208033 A208034 A208035

KEYWORD

nonn

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 November 30 21:20 EST 2021. Contains 349426 sequences. (Running on oeis4.)