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!)
A207955 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically 1
2, 16, 102, 989, 15839, 454223, 22743106, 1965912435, 292568573966, 74527048580258, 32449227184884623, 24089588153258657647, 30462508808101945246072, 65556106479277551484530086 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207960

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A208159 A208282 A207236 * A207494 A207117 A208415

Adjacent sequences:  A207952 A207953 A207954 * A207956 A207957 A207958

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 21 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 1 05:17 EST 2021. Contains 349426 sequences. (Running on oeis4.)