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!)
A207660 Number of nX7 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 0 vertically 1
42, 1764, 8928, 47320, 284272, 1806676, 12327618, 87753008, 651328292, 4960764186, 38639433738, 305186378918, 2437962689512, 19615699465126, 158722646817678, 1289041298468286, 10498617133779346, 85668476633718976 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A207661

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207351 A207773 A207900 * A207452 A208554 A207922

Adjacent sequences:  A207657 A207658 A207659 * A207661 A207662 A207663

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 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 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)