This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A203401 Number of (n+2)X(n+2) binary arrays avoiding patterns 000 and 111 in rows and columns 0
 102, 2030, 60232, 3858082, 446672706, 101578277384, 43680343039806, 36133311325799774, 57061338836892846628, 172603583392706027305210 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A203407 LINKS EXAMPLE Some solutions for n=3 ..1..0..1..0..0....0..1..0..1..0....1..0..0..1..0....1..0..0..1..0 ..1..0..0..1..0....0..0..1..0..0....0..0..1..0..0....0..1..1..0..1 ..0..1..1..0..1....1..1..0..1..1....1..1..0..1..1....1..0..1..0..1 ..1..0..1..0..0....0..0..1..0..0....0..1..1..0..0....0..1..0..1..0 ..0..1..0..1..0....1..0..1..1..0....0..0..1..0..1....1..0..1..1..0 CROSSREFS Sequence in context: A163435 A223308 A230737 * A217331 A284448 A274252 Adjacent sequences:  A203398 A203399 A203400 * A203402 A203403 A203404 KEYWORD nonn AUTHOR R. H. Hardin Jan 01 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.

Last modified December 15 20:00 EST 2019. Contains 330000 sequences. (Running on oeis4.)