This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A205305 Number of nX3 0..3 arrays with no occurence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order 1
 4, 159, 7445, 381958, 19490790, 996536552, 50933680120, 2603456557653, 133072628448179, 6801873967993408, 347670725973943044, 17770830778194675356, 908337669425005770376, 46428742540607711341143 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A205310 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 45*a(n-1) +360*a(n-2) -2443*a(n-3) +752*a(n-4) +1861*a(n-5) +17330*a(n-6) +3931*a(n-7) -55696*a(n-8) -6621*a(n-9) +28764*a(n-10) -5265*a(n-11) -9477*a(n-12) +1080*a(n-13) +1080*a(n-14) EXAMPLE Some solutions for n=5 ..0..0..1....0..0..1....0..0..1....0..0..1....0..1..0....0..1..1....0..0..1 ..0..2..0....0..1..0....1..2..1....2..0..2....1..0..0....2..1..1....2..0..3 ..3..1..1....2..2..1....1..3..2....2..1..1....0..1..1....0..2..0....3..1..1 ..2..0..2....1..3..2....0..3..3....0..1..1....1..0..2....3..0..0....0..1..2 ..0..1..0....0..1..0....0..1..3....2..2..3....3..0..1....2..1..1....1..2..0 CROSSREFS Sequence in context: A204680 A205156 A268007 * A268047 A278770 A264568 Adjacent sequences:  A205302 A205303 A205304 * A205306 A205307 A205308 KEYWORD nonn AUTHOR R. H. Hardin Jan 25 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 24 20:53 EDT 2019. Contains 323534 sequences. (Running on oeis4.)