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A269408 Number of length-n 0..7 arrays with no repeated value greater than or equal to the previous repeated value. 1
8, 64, 504, 3948, 30744, 238224, 1837752, 14121282, 108123624, 825227424, 6279994728, 47663522844, 360868232424, 2726022470928, 20549497120776, 154606709405835, 1161096042133440, 8705061811230400, 65160664171875440 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A269409.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 56*a(n-1) -1344*a(n-2) +17752*a(n-3) -135716*a(n-4) +545496*a(n-5) -463792*a(n-6) -4675336*a(n-7) +12240018*a(n-8) +21847336*a(n-9) -72913568*a(n-10) -123833976*a(n-11) +152002508*a(n-12) +520479176*a(n-13) +513890832*a(n-14) +230592040*a(n-15) +40353607*a(n-16)

EXAMPLE

Some solutions for n=5

..6. .0. .0. .4. .7. .2. .6. .3. .2. .6. .6. .4. .4. .3. .1. .5

..6. .1. .7. .7. .1. .1. .3. .4. .0. .2. .6. .7. .2. .0. .1. .2

..7. .7. .6. .4. .5. .6. .4. .2. .5. .5. .5. .1. .4. .6. .2. .4

..5. .7. .5. .4. .1. .2. .3. .3. .5. .2. .1. .6. .5. .1. .0. .0

..0. .3. .1. .7. .7. .4. .3. .1. .1. .7. .0. .3. .3. .1. .3. .0

CROSSREFS

Cf. A269409.

Sequence in context: A269639 A269536 A269677 * A269605 A269466 A127426

Adjacent sequences:  A269405 A269406 A269407 * A269409 A269410 A269411

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 25 2016

STATUS

approved

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Last modified October 28 04:43 EDT 2021. Contains 348313 sequences. (Running on oeis4.)