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A278850
Number of nX3 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.
1
0, 1, 66, 1348, 15066, 118158, 731444, 3813048, 17413532, 71497004, 268726051, 936836634, 3059698312, 9435007950, 27642602449, 77344108820, 207567987387, 536252189264, 1337891704776, 3232242731921, 7579822554305, 17290405684287
OFFSET
1,3
COMMENTS
Column 3 of A278855.
FORMULA
Empirical polynomial of degree 27 (see link above)
EXAMPLE
Some solutions for n=4
..1..0..0. .0..1..0. .1..1..0. .0..1..0. .0..1..1. .1..0..1. .0..1..0
..0..0..1. .1..1..0. .0..1..0. .1..1..0. .0..1..0. .0..0..0. .1..0..0
..1..0..0. .1..0..1. .1..0..1. .1..0..0. .0..0..0. .1..1..1. .0..1..0
..0..1..1. .0..0..1. .0..0..1. .0..0..1. .0..1..0. .1..0..0. .0..0..1
CROSSREFS
Cf. A278855.
Sequence in context: A231287 A263522 A269693 * A104673 A251047 A279889
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 29 2016
STATUS
approved