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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A207863 Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors) 0
 1, 4, 2052, 455546040, 103204230192540988 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A207868 LINKS EXAMPLE Some solutions for n=5 ..0..1..0..1..0....0..1..0..1..0....0..1..2..0..1....0..1..0..1..0 ..1..0..1..0..1....1..0..1..0..1....1..0..1..3..0....1..0..1..0..1 ..0..1..0..1..0....2..3..0..1..2....0..1..0..1..2....0..1..0..1..0 ..2..0..1..0..1....0..1..2..0..1....1..0..1..0..1....1..0..1..0..1 ..0..1..0..1..0....1..0..1..4..0....0..1..0..1..0....0..1..0..1..0 CROSSREFS Sequence in context: A198716 A004815 A198907 * A220941 A012869 A172941 Adjacent sequences: A207860 A207861 A207862 * A207864 A207865 A207866 KEYWORD nonn AUTHOR R. H. Hardin Feb 21 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 December 3 16:55 EST 2022. Contains 358534 sequences. (Running on oeis4.)