The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A222511 Number of 3Xn 0..1 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order 1
0, 4, 4, 15, 35, 170, 441, 2192, 5416, 26660, 66209, 328121, 816736, 4074688, 10172187, 51053330, 127212627, 643151980, 1598614930, 8135779154, 20183768037, 103256080822, 255983883834, 1314494576457, 3259213240495, 16780895442470 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A222509
LINKS
EXAMPLE
All solutions for n=3
..0..0..0....0..0..0....0..1..0....0..0..0
..1..0..0....0..0..1....1..1..1....0..0..0
..0..0..0....0..0..0....1..1..1....1..0..1
CROSSREFS
Sequence in context: A068592 A198313 A219350 * A135944 A268169 A177241
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 23 2013
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 19 20:30 EDT 2024. Contains 372703 sequences. (Running on oeis4.)