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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221820 Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns 0
 0, 40, 379, 29412, 854959, 35948127, 1290833232, 49447514716, 1844208808987, 69554410132666, 2610306743813999, 98167800387966673 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A221817 LINKS Table of n, a(n) for n=1..12. EXAMPLE Some solutions for n=3 ..1..2..1....1..1..0....1..2..0....0..2..0....1..3..1....1..0..0....0..2..1 ..0..2..0....0..2..1....0..2..1....1..2..1....0..1..0....0..3..1....0..3..0 ..0..1..0....1..3..0....1..1..1....0..1..1....1..2..0....1..3..0....2..3..1 ..1..3..1....1..2..0....0..3..0....1..3..0....1..2..0....1..2..0....0..0..0 CROSSREFS Sequence in context: A252180 A008355 A229716 * A301528 A253132 A293969 Adjacent sequences: A221817 A221818 A221819 * A221821 A221822 A221823 KEYWORD nonn AUTHOR R. H. Hardin Jan 26 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 September 26 17:49 EDT 2023. Contains 365666 sequences. (Running on oeis4.)