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A268015 Number of nX3 0..2 arrays with every repeated value in every row and column greater than or equal to the previous repeated value. 1
27, 729, 19683, 474552, 10941048, 240641848, 5106219048, 105087226959, 2107490863661, 41332013859375, 794974954718853, 15030454569975872, 279880270014528000, 5140991504979000000, 93278442949595408448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A268019.

LINKS

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

FORMULA

Empirical: a(n) = 84*a(n-1) -2814*a(n-2) +45276*a(n-3) -285019*a(n-4) -1063944*a(n-5) +20124468*a(n-6) -1605816*a(n-7) -630123753*a(n-8) -402925572*a(n-9) +10392502302*a(n-10) +30566899188*a(n-11) +12457260613*a(n-12) -49186967088*a(n-13) -30986023080*a(n-14) +49186967088*a(n-15) +12457260613*a(n-16) -30566899188*a(n-17) +10392502302*a(n-18) +402925572*a(n-19) -630123753*a(n-20) +1605816*a(n-21) +20124468*a(n-22) +1063944*a(n-23) -285019*a(n-24) -45276*a(n-25) -2814*a(n-26) -84*a(n-27) -a(n-28)

EXAMPLE

Some solutions for n=3

..2..0..2....2..0..2....2..2..0....0..0..2....1..1..0....0..2..0....2..0..2

..0..0..2....1..0..2....2..0..1....2..2..0....0..1..2....2..1..1....0..2..2

..1..2..0....0..1..2....1..0..2....0..0..0....0..2..0....1..2..0....2..1..1

CROSSREFS

Cf. A268019.

Sequence in context: A228973 A171301 A098838 * A009971 A307388 A046240

Adjacent sequences:  A268012 A268013 A268014 * A268016 A268017 A268018

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 24 2016

STATUS

approved

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Last modified December 7 15:24 EST 2021. Contains 349581 sequences. (Running on oeis4.)