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A269434 Number of length-n 0..7 arrays with no repeated value greater than the previous repeated value. 1
8, 64, 512, 4068, 32152, 252932, 1981512, 15465934, 120310016, 933059856, 7216323640, 55670133422, 428465939112, 3290601897928, 25221303496496, 192953793764769, 1473623863797808, 11236105478130612, 85542959337048488 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A269435.

LINKS

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

FORMULA

Empirical: a(n) = 56*a(n-1) -1364*a(n-2) +18816*a(n-3) -159866*a(n-4) +846328*a(n-5) -2642416*a(n-6) +3954888*a(n-7) -157507*a(n-8) -3954888*a(n-9) -2642416*a(n-10) -846328*a(n-11) -159866*a(n-12) -18816*a(n-13) -1364*a(n-14) -56*a(n-15) -a(n-16)

EXAMPLE

Some solutions for n=5

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

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

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

..1. .1. .1. .1. .6. .1. .3. .5. .1. .1. .6. .7. .0. .0. .6. .0

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

CROSSREFS

Cf. A269435.

Sequence in context: A222937 A269618 A269582 * A269689 A269493 A269775

Adjacent sequences:  A269431 A269432 A269433 * A269435 A269436 A269437

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 26 2016

STATUS

approved

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Last modified May 13 02:36 EDT 2021. Contains 343836 sequences. (Running on oeis4.)