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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221830 Number of 3Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns 1
 0, 14, 202, 2879, 40983, 583419, 8304016, 118195328, 1682332699, 23945477164, 340827864824, 4851172222091, 69049142818994, 982810732310121, 13988833113623959, 199110007092542464, 2834031588079597413 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 3 of A221828 LINKS R. H. Hardin, Table of n, a(n) for n = 1..184 FORMULA Empirical: a(n) = 17*a(n-1) -39*a(n-2) -14*a(n-3) +134*a(n-4) -161*a(n-5) +50*a(n-6) -147*a(n-7) +129*a(n-8) +215*a(n-9) -131*a(n-10) +53*a(n-11) -92*a(n-12) -97*a(n-13) +31*a(n-14) -27*a(n-15) +16*a(n-16) +6*a(n-17) for n>18 EXAMPLE Some solutions for n=3 ..0..2..0....1..1..1....1..1..2....1..1..0....1..1..0....0..2..0....1..1..0 ..1..1..1....0..1..1....1..1..1....3..0..1....2..1..0....2..1..2....3..2..0 ..1..2..1....1..3..0....1..1..0....1..1..1....2..2..0....0..1..1....1..1..0 CROSSREFS Sequence in context: A051817 A199707 A222586 * A068769 A113349 A109764 Adjacent sequences: A221827 A221828 A221829 * A221831 A221832 A221833 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 13 08:45 EDT 2024. Contains 375904 sequences. (Running on oeis4.)