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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221458 Number of 0..7 arrays of length n with each element unequal to at least one neighbor, with new values introduced in 0..7 order 1
 0, 1, 2, 7, 25, 102, 456, 2219, 11639, 65320, 389533, 2451393, 16164044, 110866328, 785411383, 5709898562, 42358751505, 319155928942, 2433165471304, 18714220718157, 144885627697659, 1127182676182780, 8800901309557829 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 7 of A221459 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 22*a(n-1) -168*a(n-2) +440*a(n-3) +421*a(n-4) -2898*a(n-5) -924*a(n-6) +7944*a(n-7) +5931*a(n-8) -6610*a(n-9) -10562*a(n-10) -5040*a(n-11) -840*a(n-12) EXAMPLE Some solutions for n=6 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0 ..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1 ..2....1....1....2....0....2....0....0....2....1....1....0....2....2....0....2 ..3....2....0....3....1....2....1....2....0....2....2....0....0....2....0....1 ..0....1....0....3....2....1....2....2....3....0....2....2....1....3....2....1 ..2....0....2....2....1....0....3....1....4....3....0....0....0....1....1....0 CROSSREFS Sequence in context: A036784 A221456 A221457 * A221453 A097597 A150512 Adjacent sequences: A221455 A221456 A221457 * A221459 A221460 A221461 KEYWORD nonn AUTHOR R. H. Hardin Jan 17 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 23 19:18 EDT 2024. Contains 374553 sequences. (Running on oeis4.)