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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221346 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2 1
 1, 137, 2856, 66077, 1534835, 36054361, 849482126, 20037479191, 472778990849, 11155734923302, 263229189709284, 6210988381194727, 146547761557950631, 3457733626802911867, 81582980136833112390, 1924884328527038591459 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 3 of A221345 LINKS R. H. Hardin, Table of n, a(n) for n = 1..18 EXAMPLE Some solutions for n=3 ..2..2..0....1..1..2....1..1..0....2..1..2....0..2..2....0..1..1....1..2..1 ..2..0..1....0..1..1....1..1..0....0..0..0....1..0..0....1..2..2....1..1..1 ..0..2..0....1..0..2....2..1..2....1..2..1....1..2..1....1..1..0....1..0..1 CROSSREFS Sequence in context: A215864 A190307 A094488 * A138348 A278175 A261973 Adjacent sequences: A221343 A221344 A221345 * A221347 A221348 A221349 KEYWORD nonn AUTHOR R. H. Hardin Jan 11 2013 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 24 11:31 EDT 2024. Contains 374583 sequences. (Running on oeis4.)