The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221423 Number of 5 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two. 0
 0, 32, 0, 13794, 0, 5501288, 0, 2238166260, 0, 896266172750, 0, 356943936626267, 0, 141932444866235538, 0, 56407987494575281915, 0, 22414489809013612468416, 0, 8906243419860155512004653 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE Some solutions for n=4 ..2..0..0..2....2..0..0..2....2..0..2..0....0..2..0..2....2..0..2..0 ..0..2..2..2....2..0..0..2....2..2..2..0....2..0..0..2....2..0..0..2 ..0..2..2..0....2..2..0..0....0..2..2..0....2..0..0..2....2..0..0..0 ..0..0..0..2....0..2..2..2....0..0..2..0....2..0..0..0....2..2..2..0 ..2..0..0..2....0..0..2..0....2..0..0..2....2..0..2..2....2..0..0..2 CROSSREFS Row 5 of A221419. Sequence in context: A240253 A057376 A079312 * A062543 A086820 A174923 Adjacent sequences:  A221420 A221421 A221422 * A221424 A221425 A221426 KEYWORD nonn AUTHOR R. H. Hardin, Jan 15 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 28 06:29 EST 2020. Contains 331317 sequences. (Running on oeis4.)