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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221230 Number of nX2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2 1
 1, 14, 119, 852, 6360, 47334, 351402, 2609499, 19373481, 143810755, 1067445448, 7922843437, 58803820979, 436439347912, 3239207207387, 24040945903904, 178428089506023, 1324262997498462, 9828446743250451, 72944964878131496 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A221234 LINKS R. H. Hardin, Table of n, a(n) for n = 1..209 FORMULA Empirical: a(n) = 13*a(n-1) -48*a(n-2) +60*a(n-3) -124*a(n-4) +370*a(n-5) -458*a(n-6) +370*a(n-7) -768*a(n-8) +889*a(n-9) -476*a(n-10) +126*a(n-11) -17*a(n-12) +a(n-13) EXAMPLE Some solutions for n=3 ..0..1....1..2....0..2....1..1....2..2....0..2....2..1....1..2....2..2....2..1 ..2..2....0..1....1..0....2..1....0..1....0..2....1..0....0..1....0..2....1..2 ..1..0....1..1....2..1....0..1....0..1....0..2....2..0....2..0....0..0....0..0 CROSSREFS Sequence in context: A073383 A022642 A268446 * A240051 A202072 A280003 Adjacent sequences: A221227 A221228 A221229 * A221231 A221232 A221233 KEYWORD nonn AUTHOR R. H. Hardin Jan 05 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 February 26 12:54 EST 2024. Contains 370352 sequences. (Running on oeis4.)