The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A184040 1/9 the number of (n+1)X(n+1) 0..2 arrays with all 2X2 subblocks having the same four values 0
 9, 21, 41, 81, 153, 297, 569, 1113, 2169, 4281, 8441, 16761, 33273, 66297 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A184048 LINKS EXAMPLE Some solutions for 5X5 ..1..0..1..0..1....1..2..1..0..1....1..0..1..0..1....0..1..0..1..0 ..1..0..1..0..1....0..0..0..2..0....2..0..2..0..2....1..1..1..1..1 ..0..1..0..1..0....1..2..1..0..1....0..1..0..1..0....1..0..1..0..1 ..0..1..0..1..0....0..0..0..2..0....0..2..0..2..0....1..1..1..1..1 ..0..1..0..1..0....1..2..1..0..1....1..0..1..0..1....0..1..0..1..0 CROSSREFS Sequence in context: A338911 A107890 A110209 * A242990 A053476 A110680 Adjacent sequences: A184037 A184038 A184039 * A184041 A184042 A184043 KEYWORD nonn AUTHOR R. H. Hardin Jan 08 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.

Last modified March 24 12:09 EDT 2023. Contains 361479 sequences. (Running on oeis4.)