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A278548 Number of nX2 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes. 1
0, 70, 1531, 25402, 385040, 4880813, 50476458, 435272199, 3222371162, 21002624643, 122940347621, 656384657007, 3235421775340, 14866063786408, 64169850484506, 261881056692205, 1015819011059751, 3761887253493383 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A278553.

LINKS

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

R. H. Hardin, Empirical polynomial of degree 47

FORMULA

Empirical polynomial of degree 47 (see link above)

EXAMPLE

Some solutions for n=4

..3..0. .3..0. .0..0. .0..1. .1..3. .1..3. .2..3. .2..1. .1..1. .2..2

..3..2. .2..2. .2..2. .2..3. .3..3. .1..1. .3..1. .2..2. .2..1. .3..2

..1..0. .3..1. .3..2. .2..1. .2..3. .3..3. .3..0. .2..3. .0..0. .0..3

..1..2. .3..2. .2..2. .1..3. .0..2. .2..2. .1..3. .2..1. .2..3. .1..2

CROSSREFS

Cf. A278553.

Sequence in context: A061606 A331351 A298973 * A107421 A076430 A006296

Adjacent sequences:  A278545 A278546 A278547 * A278549 A278550 A278551

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 23 2016

STATUS

approved

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Last modified October 16 23:55 EDT 2021. Contains 348048 sequences. (Running on oeis4.)