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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A208051 Number of n X 3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical or antidiagonal neighbor (colorings ignoring permutations of colors). 4
 2, 15, 716, 83440, 18171918, 6423127757, 3376465219485, 2486327138729353, 2454996141671330713, 3143641561804718358884, 5084413934903476204054959, 10166624612435356414640715276, 24691194409056203926713355839051 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..100 (first 20 terms from R. H. Hardin) EXAMPLE Some solutions for n=4 ..0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0 ..2..3..1....2..3..1....2..3..2....2..3..1....2..3..2....2..3..4....2..3..1 ..0..2..0....0..4..5....0..4..0....1..0..2....0..1..4....0..5..0....4..5..3 ..1..3..1....5..3..4....1..2..1....2..3..0....2..0..1....1..2..1....0..6..4 CROSSREFS Column 3 of A208054. Column 6 of A216460 and column 6 of A216612. Sequence in context: A071627 A013064 A013095 * A038017 A012993 A216331 Adjacent sequences: A208048 A208049 A208050 * A208052 A208053 A208054 KEYWORD nonn AUTHOR R. H. Hardin, Feb 22 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 March 25 09:47 EDT 2023. Contains 361520 sequences. (Running on oeis4.)