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A268014 Number of nX2 0..2 arrays with every repeated value in every row and column greater than or equal to the previous repeated value. 4
9, 81, 729, 6084, 49284, 386884, 2965284, 22268961, 164378041, 1195430625, 8581613769, 60904316944, 427872974400, 2978730810000, 20567785069584, 140966727989481, 959632952511249, 6492348190361881, 43674091151207841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A268019.

LINKS

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

FORMULA

Empirical: a(n) = 25*a(n-1) -225*a(n-2) +745*a(n-3) +475*a(n-4) -6275*a(n-5) -885*a(n-6) +22525*a(n-7) +22525*a(n-8) -885*a(n-9) -6275*a(n-10) +475*a(n-11) +745*a(n-12) -225*a(n-13) +25*a(n-14) -a(n-15)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A268019.

Sequence in context: A174108 A254435 A267790 * A228972 A125947 A120997

Adjacent sequences:  A268011 A268012 A268013 * A268015 A268016 A268017

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 24 2016

STATUS

approved

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Last modified May 27 21:52 EDT 2020. Contains 334671 sequences. (Running on oeis4.)