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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

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Last modified July 30 22:16 EDT 2021. Contains 346365 sequences. (Running on oeis4.)