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A278623 Number of nX4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. 1
51, 1952, 49503, 1069536, 21121532, 387542112, 6594175430, 103536313036, 1496475492375, 19928249063688, 245280439959902, 2802425055340520, 29863427285241827, 298206737876251916, 2802780797553511873 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A278627.

LINKS

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

R. H. Hardin, Empirical polynomial of degree 125

FORMULA

Empirical polynomial of degree 125 (see link above)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A278627.

Sequence in context: A202044 A238319 A014943 * A288604 A278305 A231660

Adjacent sequences:  A278620 A278621 A278622 * A278624 A278625 A278626

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 24 2016

STATUS

approved

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Last modified October 19 23:51 EDT 2021. Contains 348095 sequences. (Running on oeis4.)