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!)
A202641 Number of (n+2)X4 binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals 1
172, 530, 1766, 5948, 19880, 66924, 224940, 755816, 2541276, 8543094, 28716716, 96540806, 324538890, 1090985388, 3667580154, 12329245406, 41447005012, 139332080292, 468390834050, 1574583459558, 5293259411920, 17794285178750 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A202647
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +7*a(n-2) +a(n-3) -28*a(n-4) -30*a(n-5) +56*a(n-6) +71*a(n-7) -64*a(n-8) -74*a(n-9) +42*a(n-10) +39*a(n-11) -18*a(n-12) -9*a(n-13) +6*a(n-14) +a(n-15) -a(n-16) for n>17
EXAMPLE
Some solutions for n=3
..1..0..0..1....1..0..1..1....1..1..0..1....0..1..1..0....1..0..1..1
..0..0..1..1....1..0..1..0....0..0..1..0....0..1..0..1....1..0..1..0
..0..1..0..0....0..1..0..0....1..1..0..0....1..0..0..1....0..1..0..0
..1..0..0..1....1..1..0..1....0..0..1..1....0..0..1..0....1..0..0..1
..1..0..1..1....1..0..1..1....1..0..1..0....0..1..1..0....0..1..1..0
CROSSREFS
Sequence in context: A261706 A043387 A246475 * A234998 A234992 A213992
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 22 2011
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 18 18:37 EDT 2024. Contains 372664 sequences. (Running on oeis4.)