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!)
A209824 Number of (n+1)X4 0..2 arrays with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in row major order 1
218, 4418, 90000, 1842509, 37744836, 773359089, 15846003427, 324684577671, 6652797311199, 136316077450664, 2793121983572647, 57231184269590694, 1172669322792974754, 24028042740488215416, 492335585844232823766 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A209829
LINKS
FORMULA
Empirical: a(n) = 24*a(n-1) -62*a(n-2) -226*a(n-3) +445*a(n-4) +475*a(n-5) -811*a(n-6) +29*a(n-7) +147*a(n-8) -20*a(n-9)
EXAMPLE
Some solutions for n=4
..0..1..0..1....0..0..1..0....0..0..0..1....0..1..0..0....0..0..0..0
..1..0..0..0....0..1..1..1....2..2..0..0....0..1..0..0....0..1..0..0
..1..0..2..2....0..0..1..2....1..2..0..1....0..1..0..2....0..0..0..2
..1..0..2..1....2..0..1..1....2..2..0..0....0..0..0..2....0..0..2..2
..1..0..2..1....2..0..0..1....0..2..2..0....2..0..0..2....0..2..2..1
CROSSREFS
Sequence in context: A253732 A232513 A224741 * A230333 A060530 A252997
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 13 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 07:19 EDT 2024. Contains 373423 sequences. (Running on oeis4.)