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A278409
Number of n X 3 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
1
1, 264, 9354, 201539, 3576730, 58069125, 859516239, 11336482734, 132278417831, 1373129978107, 12814886712893, 108729955660224, 847319762234831, 6118517452942163, 41248241307153636, 261266409367793037
OFFSET
1,2
COMMENTS
Column 3 of A278414.
FORMULA
Empirical polynomial of degree 80 (see link above).
EXAMPLE
Some solutions for n=3
..2..0..0. .1..2..0. .1..0..0. .1..0..1. .1..1..1. .1..2..0. .0..2..2
..2..1..1. .2..1..1. .2..1..2. .2..1..0. .2..1..2. .2..0..2. .2..2..1
..0..0..1. .2..1..0. .2..0..1. .0..2..1. .1..1..1. .1..1..2. .0..1..2
CROSSREFS
Cf. A278414.
Sequence in context: A022043 A035315 A288877 * A168196 A264682 A107507
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 21 2016
STATUS
approved