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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A186559 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock 1
 19683, 173, 1399, 8983, 21007, 29935, 47719, 82783, 168391, 441199, 1129591, 2679679, 6669991, 15566383, 34790167, 83037151, 194778055, 446546575, 1070609527, 2528845759, 5841194023, 13884206959, 32712096727, 75846181663 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A186568 LINKS R. H. Hardin, Table of n, a(n) for n = 1..26 EXAMPLE Some solutions for 4X4 ..0..0..0..0....0..0..0..0....2..1..1..2....0..1..0..0....0..0..0..0 ..0..0..0..0....0..0..0..0....1..2..1..1....0..0..1..0....1..0..0..0 ..1..0..0..0....0..0..0..0....1..1..2..1....1..0..0..1....2..1..0..0 ..2..0..0..0....1..1..1..1....2..1..1..2....0..1..0..0....1..2..1..0 CROSSREFS Sequence in context: A234782 A206133 A321825 * A186568 A186560 A046322 Adjacent sequences:  A186556 A186557 A186558 * A186560 A186561 A186562 KEYWORD nonn AUTHOR R. H. Hardin Feb 23 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)