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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A205910 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors and the same number of counterclockwise edge increases as its vertical neighbors. 0
 81, 1791, 87918, 14150391, 6011669886, 6566654061039, 18225426305218983, 128865421969802643036, 2315569396435124102371935 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A205917. LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for n=4: ..1..0..2..2..0....1..0..0..1..2....2..2..2..0..1....2..1..0..1..0 ..0..0..0..0..0....0..2..1..0..2....0..2..0..0..0....2..1..1..1..1 ..0..1..1..1..0....0..1..1..2..2....2..2..0..2..2....1..1..2..1..2 ..0..0..1..0..0....1..0..2..1..0....0..2..2..2..0....0..1..1..1..1 ..0..1..1..0..2....1..2..2..0..0....2..2..0..0..0....0..1..0..0..1 CROSSREFS Sequence in context: A237801 A328683 A236057 * A236811 A206669 A223206 Adjacent sequences: A205907 A205908 A205909 * A205911 A205912 A205913 KEYWORD nonn AUTHOR R. H. Hardin, Feb 01 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.

Last modified July 14 02:38 EDT 2024. Contains 374291 sequences. (Running on oeis4.)